Microsoft Windows is a group of several graphical operating system families, all of which are developed and sold by Microsoft. Each family caters to a certain sector of the computing industry. Active Windows families include Windows Embedded. Defunct Windows families include Windows Mobile and Windows Phone. Microsoft introduced an operating environment named Windows on November 20, 1985, as a graphical operating system shell for MS-DOS in response to the growing interest in graphical user interfaces. Microsoft Windows came to dominate the world's personal computer market with over 90% market share, overtaking Mac OS, introduced in 1984. Apple came to see Windows as an unfair encroachment on their innovation in GUI development as implemented on products such as the Lisa and Macintosh. On PCs, Windows is still the most popular operating system. However, in 2014, Microsoft admitted losing the majority of the overall operating system market to Android, because of the massive growth in sales of Android smartphones.
In 2014, the number of Windows devices sold was less than 25 %. This comparison however may not be relevant, as the two operating systems traditionally target different platforms. Still, numbers for server use of Windows show one third market share, similar to that for end user use; as of October 2018, the most recent version of Windows for PCs, tablets and embedded devices is Windows 10. The most recent versions for server computers is Windows Server 2019. A specialized version of Windows runs on the Xbox One video game console. Microsoft, the developer of Windows, has registered several trademarks, each of which denote a family of Windows operating systems that target a specific sector of the computing industry; as of 2014, the following Windows families are being developed: Windows NT: Started as a family of operating systems with Windows NT 3.1, an operating system for server computers and workstations. It now consists of three operating system subfamilies that are released at the same time and share the same kernel: Windows: The operating system for mainstream personal computers and smartphones.
The latest version is Windows 10. The main competitor of this family is macOS by Apple for personal computers and Android for mobile devices. Windows Server: The operating system for server computers; the latest version is Windows Server 2019. Unlike its client sibling, it has adopted a strong naming scheme; the main competitor of this family is Linux. Windows PE: A lightweight version of its Windows sibling, meant to operate as a live operating system, used for installing Windows on bare-metal computers, recovery or troubleshooting purposes; the latest version is Windows PE 10. Windows IoT: Initially, Microsoft developed Windows CE as a general-purpose operating system for every device, too resource-limited to be called a full-fledged computer. However, Windows CE was renamed Windows Embedded Compact and was folded under Windows Compact trademark which consists of Windows Embedded Industry, Windows Embedded Professional, Windows Embedded Standard, Windows Embedded Handheld and Windows Embedded Automotive.
The following Windows families are no longer being developed: Windows 9x: An operating system that targeted consumers market. Discontinued because of suboptimal performance. Microsoft now caters to the consumer market with Windows NT. Windows Mobile: The predecessor to Windows Phone, it was a mobile phone operating system; the first version was called Pocket PC 2000. The last version is Windows Mobile 6.5. Windows Phone: An operating system sold only to manufacturers of smartphones; the first version was Windows Phone 7, followed by Windows Phone 8, the last version Windows Phone 8.1. It was succeeded by Windows 10 Mobile; the term Windows collectively describes any or all of several generations of Microsoft operating system products. These products are categorized as follows: The history of Windows dates back to 1981, when Microsoft started work on a program called "Interface Manager", it was announced in November 1983 under the name "Windows", but Windows 1.0 was not released until November 1985.
Windows 1.0 was to achieved little popularity. Windows 1.0 is not a complete operating system. The shell of Windows 1.0 is a program known as the MS-DOS Executive. Components included Calculator, Cardfile, Clipboard viewer, Control Panel, Paint, Reversi and Write. Windows 1.0 does not allow overlapping windows. Instead all windows are tiled. Only modal dialog boxes may appear over other windows. Microsoft sold as included Windows Development libraries with the C development environment, which included numerous windows samples. Windows 2.0 was released in December 1987, was more popular than its predecessor. It features several improvements to the user memory management. Windows 2.03 changed the OS from tiled windows to overlapping windows. The result of this change led to Apple Computer filing a suit against Microsoft alleging infringement on Apple's copyrights. Windows 2.0
Hard disk drive
A hard disk drive, hard disk, hard drive, or fixed disk, is an electromechanical data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rotating disks coated with magnetic material. The platters are paired with magnetic heads arranged on a moving actuator arm, which read and write data to the platter surfaces. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. HDDs are a type of non-volatile storage, retaining stored data when powered off. Introduced by IBM in 1956, HDDs became the dominant secondary storage device for general-purpose computers by the early 1960s. Continuously improved, HDDs have maintained this position into the modern era of servers and personal computers. More than 200 companies have produced HDDs though after extensive industry consolidation most units are manufactured by Seagate and Western Digital. HDDs dominate the volume of storage produced for servers.
Though production is growing sales revenues and unit shipments are declining because solid-state drives have higher data-transfer rates, higher areal storage density, better reliability, much lower latency and access times. The revenues for SSDs, most of which use NAND exceed those for HDDs. Though SSDs have nearly 10 times higher cost per bit, they are replacing HDDs in applications where speed, power consumption, small size, durability are important; the primary characteristics of an HDD are its performance. Capacity is specified in unit prefixes corresponding to powers of 1000: a 1-terabyte drive has a capacity of 1,000 gigabytes; some of an HDD's capacity is unavailable to the user because it is used by the file system and the computer operating system, inbuilt redundancy for error correction and recovery. There is confusion regarding storage capacity, since capacities are stated in decimal Gigabytes by HDD manufacturers, whereas some operating systems report capacities in binary Gibibytes, which results in a smaller number than advertised.
Performance is specified by the time required to move the heads to a track or cylinder adding the time it takes for the desired sector to move under the head, the speed at which the data is transmitted. The two most common form factors for modern HDDs are 3.5-inch, for desktop computers, 2.5-inch for laptops. HDDs are connected to systems by standard interface cables such as SATA, USB or SAS cables; the first production IBM hard disk drive, the 350 disk storage, shipped in 1957 as a component of the IBM 305 RAMAC system. It was the size of two medium-sized refrigerators and stored five million six-bit characters on a stack of 50 disks. In 1962, the IBM 350 was superseded by the IBM 1301 disk storage unit, which consisted of 50 platters, each about 1/8-inch thick and 24 inches in diameter. While the IBM 350 used only two read/write heads, the 1301 used an array of heads, one per platter, moving as a single unit. Cylinder-mode read/write operations were supported, the heads flew about 250 micro-inches above the platter surface.
Motion of the head array depended upon a binary adder system of hydraulic actuators which assured repeatable positioning. The 1301 cabinet was about the size of three home refrigerators placed side by side, storing the equivalent of about 21 million eight-bit bytes. Access time was about a quarter of a second. In 1962, IBM introduced the model 1311 disk drive, about the size of a washing machine and stored two million characters on a removable disk pack. Users could interchange them as needed, much like reels of magnetic tape. Models of removable pack drives, from IBM and others, became the norm in most computer installations and reached capacities of 300 megabytes by the early 1980s. Non-removable HDDs were called "fixed disk" drives; some high-performance HDDs were manufactured with one head per track so that no time was lost physically moving the heads to a track. Known as fixed-head or head-per-track disk drives they were expensive and are no longer in production. In 1973, IBM introduced a new type of HDD code-named "Winchester".
Its primary distinguishing feature was that the disk heads were not withdrawn from the stack of disk platters when the drive was powered down. Instead, the heads were allowed to "land" on a special area of the disk surface upon spin-down, "taking off" again when the disk was powered on; this reduced the cost of the head actuator mechanism, but precluded removing just the disks from the drive as was done with the disk packs of the day. Instead, the first models of "Winchester technology" drives featured a removable disk module, which included both the disk pack and the head assembly, leaving the actuator motor in the drive upon removal. "Winchester" drives abandoned the removable media concept and returned to non-removable platters. Like the first removable pack drive, the first "Winchester" drives used platters 14 inches in diameter. A few years designers were exploring the possibility that physically smaller platters might offer advantages. Drives with non-removable eight-inch platters appeared, drives that used a 5 1⁄4 in form factor.
The latter were intended for the then-fl
An operating system is system software that manages computer hardware and software resources and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may include accounting software for cost allocation of processor time, mass storage and other resources. For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware, although the application code is executed directly by the hardware and makes system calls to an OS function or is interrupted by it. Operating systems are found on many devices that contain a computer – from cellular phones and video game consoles to web servers and supercomputers; the dominant desktop operating system is Microsoft Windows with a market share of around 82.74%. MacOS by Apple Inc. is in second place, the varieties of Linux are collectively in third place. In the mobile sector, use in 2017 is up to 70% of Google's Android and according to third quarter 2016 data, Android on smartphones is dominant with 87.5 percent and a growth rate 10.3 percent per year, followed by Apple's iOS with 12.1 percent and a per year decrease in market share of 5.2 percent, while other operating systems amount to just 0.3 percent.
Linux distributions are dominant in supercomputing sectors. Other specialized classes of operating systems, such as embedded and real-time systems, exist for many applications. A single-tasking system can only run one program at a time, while a multi-tasking operating system allows more than one program to be running in concurrency; this is achieved by time-sharing, where the available processor time is divided between multiple processes. These processes are each interrupted in time slices by a task-scheduling subsystem of the operating system. Multi-tasking may be characterized in co-operative types. In preemptive multitasking, the operating system slices the CPU time and dedicates a slot to each of the programs. Unix-like operating systems, such as Solaris and Linux—as well as non-Unix-like, such as AmigaOS—support preemptive multitasking. Cooperative multitasking is achieved by relying on each process to provide time to the other processes in a defined manner. 16-bit versions of Microsoft Windows used cooperative multi-tasking.
32-bit versions of both Windows NT and Win9x, used preemptive multi-tasking. Single-user operating systems have no facilities to distinguish users, but may allow multiple programs to run in tandem. A multi-user operating system extends the basic concept of multi-tasking with facilities that identify processes and resources, such as disk space, belonging to multiple users, the system permits multiple users to interact with the system at the same time. Time-sharing operating systems schedule tasks for efficient use of the system and may include accounting software for cost allocation of processor time, mass storage and other resources to multiple users. A distributed operating system manages a group of distinct computers and makes them appear to be a single computer; the development of networked computers that could be linked and communicate with each other gave rise to distributed computing. Distributed computations are carried out on more than one machine; when computers in a group work in cooperation, they form a distributed system.
In an OS, distributed and cloud computing context, templating refers to creating a single virtual machine image as a guest operating system saving it as a tool for multiple running virtual machines. The technique is used both in virtualization and cloud computing management, is common in large server warehouses. Embedded operating systems are designed to be used in embedded computer systems, they are designed to operate on small machines like PDAs with less autonomy. They are able to operate with a limited number of resources, they are compact and efficient by design. Windows CE and Minix 3 are some examples of embedded operating systems. A real-time operating system is an operating system that guarantees to process events or data by a specific moment in time. A real-time operating system may be single- or multi-tasking, but when multitasking, it uses specialized scheduling algorithms so that a deterministic nature of behavior is achieved. An event-driven system switches between tasks based on their priorities or external events while time-sharing operating systems switch tasks based on clock interrupts.
A library operating system is one in which the services that a typical operating system provides, such as networking, are provided in the form of libraries and composed with the application and configuration code to construct a unikernel: a specialized, single address space, machine image that can be deployed to cloud or embedded environments. Early computers were built to perform a series of single tasks, like a calculator. Basic operating system features were developed in the 1950s, such as resident monitor functions that could automatically run different programs in succession to speed up processing. Operating systems did not exist in their more complex forms until the early 1960s. Hardware features were added, that enabled use of runtime libraries and parallel processing; when personal computers became popular in the 1980s, operating systems were made for them similar in concept to those used on larger computers. In the 1940s, the earliest electronic digital systems had no operating systems.
Electronic systems of this time were programmed on rows of mechanical switches or by jumper wires on plug boards. These were special-purpose systems that, for example, generated ballistics tables for the military or controlled the pri
A computer program is a collection of instructions that performs a specific task when executed by a computer. A computer requires programs to function. A computer program is written by a computer programmer in a programming language. From the program in its human-readable form of source code, a compiler can derive machine code—a form consisting of instructions that the computer can directly execute. Alternatively, a computer program may be executed with the aid of an interpreter. A collection of computer programs and related data are referred to as software. Computer programs may be categorized along functional lines, such as application software and system software; the underlying method used for some calculation or manipulation is known as an algorithm. The earliest programmable machines preceded the invention of the digital computer. In 1801, Joseph-Marie Jacquard devised a loom that would weave a pattern by following a series of perforated cards. Patterns could be repeated by arranging the cards.
In 1837, Charles Babbage was inspired by Jacquard's loom to attempt to build the Analytical Engine. The names of the components of the calculating device were borrowed from the textile industry. In the textile industry, yarn was brought from the store to be milled; the device would have had a "store"—memory to hold 1,000 numbers of 40 decimal digits each. Numbers from the "store" would have been transferred to the "mill", for processing, and a "thread" being the execution of programmed instructions by the device. It was programmed using two sets of perforated cards—one to direct the operation and the other for the input variables. However, after more than 17,000 pounds of the British government's money, the thousands of cogged wheels and gears never worked together. During a nine-month period in 1842–43, Ada Lovelace translated the memoir of Italian mathematician Luigi Menabrea; the memoir covered the Analytical Engine. The translation contained Note G which detailed a method for calculating Bernoulli numbers using the Analytical Engine.
This note is recognized by some historians as the world's first written computer program. In 1936, Alan Turing introduced the Universal Turing machine—a theoretical device that can model every computation that can be performed on a Turing complete computing machine, it is a finite-state machine. The machine can move the tape forth, changing its contents as it performs an algorithm; the machine starts in the initial state, goes through a sequence of steps, halts when it encounters the halt state. This machine is considered by some to be the origin of the stored-program computer—used by John von Neumann for the "Electronic Computing Instrument" that now bears the von Neumann architecture name; the Z3 computer, invented by Konrad Zuse in Germany, was a programmable computer. A digital computer uses electricity as the calculating component; the Z3 contained 2,400 relays to create the circuits. The circuits provided a floating-point, nine-instruction computer. Programming the Z3 was through a specially designed keyboard and punched tape.
The Electronic Numerical Integrator And Computer was a Turing complete, general-purpose computer that used 17,468 vacuum tubes to create the circuits. At its core, it was a series of Pascalines wired together, its 40 units weighed 30 tons, occupied 1,800 square feet, consumed $650 per hour in electricity when idle. It had 20 base-10 accumulators. Programming the ENIAC took up to two months. Three function tables needed to be rolled to fixed function panels. Function tables were connected to function panels using heavy black cables; each function table had 728 rotating knobs. Programming the ENIAC involved setting some of the 3,000 switches. Debugging a program took a week; the programmers of the ENIAC were women who were known collectively as the "ENIAC girls." The ENIAC featured parallel operations. Different sets of accumulators could work on different algorithms, it used punched card machines for input and output, it was controlled with a clock signal. It ran for eight years, calculating hydrogen bomb parameters, predicting weather patterns, producing firing tables to aim artillery guns.
The Manchester Baby was a stored-program computer. Programming transitioned away from setting dials. Only three bits of memory were available to store each instruction, so it was limited to eight instructions. 32 switches were available for programming. Computers manufactured; the computer program was written on paper for reference. An instruction was represented by a configuration of on/off settings. After setting the configuration, an execute button was pressed; this process was repeated. Computer programs were manually input via paper tape or punched cards. After the medium was loaded, the starting address was set via switches and the execute button pressed. In 1961, the Burroughs B5000 was built to be programmed in the ALGOL 60 language; the hardware featured circuits to ease the compile phase. In 1964, the IBM System/360 was a line of six computers each having the same instruction set architecture; the Model 30 was the least expensive. Customers could retain the same application software; each System/360 model featured multiprogramming.
With operating system support, multiple programs could be in memory at once. When one was waiting for input/output, another could compute; each model could emulate other computers. Customers could upgrade to the System/360 and ret
MG Rover Group
MG Rover Group was the last domestically owned mass-production car manufacturer in the British motor industry. The company was formed when BMW sold the car-making and engine manufacturing assets of the original Rover Group to the Phoenix Consortium in 2000. MG Rover went into administration in 2005 and its key assets were purchased by Nanjing Automobile Group, with Nanjing restarting MG sports car and sports saloon production in 2007. During that year Nanjing merged with SAIC Motor. During 2009 the UK Subsidiary was renamed MG Motor UK; the MG TF was manufactured at the former MG Rover Longbridge plant and sold within the UK from 2008 to 2010. In 2011 the first all new MG for 16 years was launched in the UK. During 2013 a super-mini was added to the line up, this went on to help MG Motor become the fastest growing car manufacturer within the UK in 2014; the Rover brand, retained by BMW and licensed to MG Rover, was sold to Ford, which had bought Land Rover from BMW in 2000. The rights to the dormant Rover brand were sold by Ford, along with the Jaguar Cars and Land Rover businesses, to Tata Motors in 2008.
MG Rover was formed from the parts of the former Rover Group volume car production business which BMW sold off in 2000 due to constant losses and a declining market share. BMW had acquired the Rover Group from British Aerospace in 1994 and had since sold the Land Rover business to Ford, split off the MINI business as a new BMW subsidiary based in Cowley. MG Rover took control of the volume component of the former Rover Group, which by now consisted of the Longbridge plant in Birmingham. Of the Rover Group's other two major plants; as part of these changes, all remaining Rover volume production at Cowley, was moved to Longbridge, whilst MG Rover would be allowed to continue manufacturing the original Mini at Longbridge until the new MINI was launched by BMW a year later. When BMW sold off its interests, MG Rover was bought for a nominal £10 in May 2000 by a specially assembled group of businessmen known as the Phoenix Consortium; the consortium was headed by ex-Rover Chief Executive John Towers.
When Phoenix Consortium took over, their first loss for the last eight months of 2000 were reported to be around £400m. By 2004, the company never made a profit. MG Rover's best year for car sales was their first full year of business, in 2001 — when they sold over 170,000 cars. In 2004 their sales had declined to around 120,000; the company ceased trading on 8 April 2005, with debts of over £1.4 billion, after a proposed alliance with SAIC collapsed. In relation to this, accounting firm Deloitte was fined ₤14 million in September 2013 for failing to manage conflicts of interest. Deloitte had acted as corporate finance advisers to firms involved with MG Rover and the Phoenix Consortium, including tax advice while Deloitte audited MG Rover. An independent tribunal refused to grant the right to appeal a finding that Deloitte failed to consider public interest, as of November 2013. In June 2004, it was learned that Shanghai Automotive Industry Corporation had signed a joint venture partnership to develop new models and technologies with MG Rover.
This led to much speculation among the British media suggesting the Chinese company was poised to launch a takeover. That year, in November, news broke of an agreement between the two companies to create a joint venture company to produce up to a million cars a year, with the production shared between MG Rover's Longbridge site and locations in China. SAIC were to have a 70% stake in this company in return for a £1 billion investment, with MG Rover owning the remaining 30%. However, this agreement had to be ratified by the Chinese government its National Development and Reform Commission; the Commission held the opinion that if BMW could not make a success of Rover it would be hard for SAIC to do so. On 8 December 2004, Tata of India, which had cooperated over the export of the Tata Indica as the CityRover, threatened to cease its agreement with MG Rover if the SAIC tie-up went ahead, according to the Indian press. Tata claimed. SAIC purchased the technical rights to manufacture Rover's 25 and 75 models, for the Powertrain Ltd business, for £67M.
It did not acquire the Rover name, still owned by BMW at the time. In January 2005, it was revealed that British Prime Minister Tony Blair had intervened to support the alliance between MG Rover and SAIC. MG Rover could not give a date. Figures released by the company showed that the sale of Rover-branded cars fell in 2004 compared to 2003. In April 2005 it was reported that the partnership deal with SAIC was in trouble because the British Government had decided to withdraw its offer of a £120 million loan to keep the deal going. On 7 April 2005 the company announced that it was suspending production because of component shortages. In the day, it was announced by Patricia Hewitt, the Secretary of State for Trade and Industry, that the company was being placed in receivership, her statement was based on a conversation with John Towers. It was denied by MG Rover Group, although the company admitted that it had
England is a country, part of the United Kingdom. It shares land borders with Wales to Scotland to the north-northwest; the Irish Sea lies west of England and the Celtic Sea lies to the southwest. England is separated from continental Europe by the North Sea to the east and the English Channel to the south; the country covers five-eighths of the island of Great Britain, which lies in the North Atlantic, includes over 100 smaller islands, such as the Isles of Scilly and the Isle of Wight. The area now called England was first inhabited by modern humans during the Upper Palaeolithic period, but takes its name from the Angles, a Germanic tribe deriving its name from the Anglia peninsula, who settled during the 5th and 6th centuries. England became a unified state in the 10th century, since the Age of Discovery, which began during the 15th century, has had a significant cultural and legal impact on the wider world; the English language, the Anglican Church, English law – the basis for the common law legal systems of many other countries around the world – developed in England, the country's parliamentary system of government has been adopted by other nations.
The Industrial Revolution began in 18th-century England, transforming its society into the world's first industrialised nation. England's terrain is chiefly low hills and plains in central and southern England. However, there is upland and mountainous terrain in the west; the capital is London, which has the largest metropolitan area in both the United Kingdom and the European Union. England's population of over 55 million comprises 84% of the population of the United Kingdom concentrated around London, the South East, conurbations in the Midlands, the North West, the North East, Yorkshire, which each developed as major industrial regions during the 19th century; the Kingdom of England – which after 1535 included Wales – ceased being a separate sovereign state on 1 May 1707, when the Acts of Union put into effect the terms agreed in the Treaty of Union the previous year, resulting in a political union with the Kingdom of Scotland to create the Kingdom of Great Britain. In 1801, Great Britain was united with the Kingdom of Ireland to become the United Kingdom of Great Britain and Ireland.
In 1922 the Irish Free State seceded from the United Kingdom, leading to the latter being renamed the United Kingdom of Great Britain and Northern Ireland. The name "England" is derived from the Old English name Englaland, which means "land of the Angles"; the Angles were one of the Germanic tribes that settled in Great Britain during the Early Middle Ages. The Angles came from the Anglia peninsula in the Bay of Kiel area of the Baltic Sea; the earliest recorded use of the term, as "Engla londe", is in the late-ninth-century translation into Old English of Bede's Ecclesiastical History of the English People. The term was used in a different sense to the modern one, meaning "the land inhabited by the English", it included English people in what is now south-east Scotland but was part of the English kingdom of Northumbria; the Anglo-Saxon Chronicle recorded that the Domesday Book of 1086 covered the whole of England, meaning the English kingdom, but a few years the Chronicle stated that King Malcolm III went "out of Scotlande into Lothian in Englaland", thus using it in the more ancient sense.
According to the Oxford English Dictionary, its modern spelling was first used in 1538. The earliest attested reference to the Angles occurs in the 1st-century work by Tacitus, Germania, in which the Latin word Anglii is used; the etymology of the tribal name itself is disputed by scholars. How and why a term derived from the name of a tribe, less significant than others, such as the Saxons, came to be used for the entire country and its people is not known, but it seems this is related to the custom of calling the Germanic people in Britain Angli Saxones or English Saxons to distinguish them from continental Saxons of Old Saxony between the Weser and Eider rivers in Northern Germany. In Scottish Gaelic, another language which developed on the island of Great Britain, the Saxon tribe gave their name to the word for England. An alternative name for England is Albion; the name Albion referred to the entire island of Great Britain. The nominally earliest record of the name appears in the Aristotelian Corpus the 4th-century BC De Mundo: "Beyond the Pillars of Hercules is the ocean that flows round the earth.
In it are two large islands called Britannia. But modern scholarly consensus ascribes De Mundo not to Aristotle but to Pseudo-Aristotle, i.e. it was written in the Graeco-Roman period or afterwards. The word Albion or insula Albionum has two possible origins, it either derives from a cognate of the Latin albus meaning white, a reference to the white cliffs of Dover or from the phrase the "island of the Albiones" in the now lost Massaliote Periplus, attested through Avienus' Ora Maritima to which the former served as a source. Albion is now applied to England in a more poetic capacity. Another romantic name for England is Loegria, related to the Welsh word for England and made popular by its use in Arthurian legend; the earliest known evidence of human presence in the area now known as England was that of Homo antecessor, dating to approximate
Nottingham is a city and unitary authority area in Nottinghamshire, England, 128 miles north of London, 45 miles northeast of Birmingham and 56 miles southeast of Manchester, in the East Midlands. Nottingham has links to the legend of Robin Hood and to the lace-making and tobacco industries, it was granted its city charter in 1897 as part of Queen Victoria's Diamond Jubilee celebrations. Nottingham is a tourist destination. In 2017, Nottingham had an estimated population of 329,200; the population of the city proper, compared to its regional counterparts, has been attributed to its historical and tightly-drawn city boundaries. The wider conurbation, which includes many of the city's suburbs, has a population of 768,638, it is the second-largest in The Midlands. Its Functional Urban Area the largest in the East Midlands, has a population of 912,482; the population of the Nottingham/Derby metropolitan area is estimated to be 1,610,000. Its metropolitan economy is the seventh largest in the United Kingdom with a GDP of $50.9bn.
The city was the first in the East Midlands to be ranked as a sufficiency-level world city by the Globalization and World Cities Research Network. Nottingham has an award-winning public transport system, including the largest publicly owned bus network in England and is served by Nottingham railway station and the modern Nottingham Express Transit tram system, it is a major sporting centre, in October 2015 was named'Home of English Sport'. The National Ice Centre, Holme Pierrepont National Watersports Centre, Trent Bridge international cricket ground are all based in or around the city, the home of two professional league football teams; the city has professional rugby, ice hockey and cricket teams, the Aegon Nottingham Open, an international tennis tournament on the ATP and WTA tours. This accolade came just over a year. On 11 December 2015, Nottingham was named a "City of Literature" by UNESCO, joining Dublin, Edinburgh and Prague as one of only a handful in the world; the title reflects Nottingham's literary heritage, with Lord Byron, D. H. Lawrence and Alan Sillitoe having links to the city, as well as a contemporary literary community, a publishing industry and a poetry scene.
The city has two universities—Nottingham Trent University and the University of Nottingham—both of which are spread over several campuses in the city, with a total university student population of over 61,000. The city predates Anglo-Saxon times and was known in Brythonic as Tigguo Cobauc, meaning Place of Caves. In modern Welsh it is known poetically as Y Ty Ogofog and Irish as Na Tithe Uaimh "The Cavey Dwelling"; when it fell under the rule of a Saxon chieftain named Snot it became known as "Snotingaham". Some authors derive "Nottingham" from Snottenga and ham, but "this has nothing to do with the English form". Nottingham Castle was constructed in 1068 on a sandstone outcrop by the River Leen; the Anglo-Saxon settlement was confined to the area today known as the Lace Market and was surrounded by a substantial defensive ditch and rampart, which fell out of use following the Norman Conquest and was filled by the time of the Domesday Survey. Following the Norman Conquest the Saxon settlement developed into the English Borough of Nottingham and housed a Town Hall and Law Courts.
A settlement developed around the castle on the hill opposite and was the French borough supporting the Normans in the castle. The space between was built on as the town grew and the Old Market Square became the focus of Nottingham several centuries later. Defences, consisted of a ditch and bank in the early 12th century; the ditch was widened, in the mid-13th century, a stone wall built around much of the perimeter of the town. A short length of the wall survives, is visible at the northern end of Maid Marian Way, is protected as a Scheduled Monument. On the return of Richard the Lionheart from the Crusades, the castle was occupied by supporters of Prince John, including the Sheriff of Nottingham, it was besieged by Richard and, after a sharp conflict, was captured. In the legends of Robin Hood, Nottingham Castle is the scene of the final showdown between the Sheriff and the hero outlaw. By the 15th century Nottingham had established itself as a centre of a thriving export trade in religious sculpture made from Nottingham alabaster.
The town became a county corporate in 1449 giving it effective self-government, in the words of the charter, "for eternity". The Castle and Shire Hall were expressly excluded and remained as detached Parishes of Nottinghamshire. One of those impressed by Nottingham in the late 18th century was the German traveller C. P. Moritz, who wrote in 1782, "Of all the towns I have seen outside London, Nottingham is the loveliest and neatest. Everything had a modern look, a large space in the centre was hardly less handsome than a London square. A charming footpath leads over the fields to the highway. … Nottingham … with its high houses, red roofs and church steeples, looks excellent from a distance."During the Industrial Revolution, much of Nottingham's prosperity was founded on the textile industry.