History of operating systems
Computer operating systems (OSes) provide a set of functions needed and used by most application programs on a computer, and the links needed to control and synchronize computer hardware. On the first computers, with no operating system, every program needed the full hardware specification to run correctly and perform standard tasks, and its own drivers for peripheral devices like printers and punched paper card readers. The growing complexity of hardware and application programs eventually made operating systems a necessity for everyday use.
Apple Lisa running Lisa OS
Android is the most used mobile operating system.
An operating system (OS) is system software that manages computer hardware and software resources, and provides common services for computer programs.
An IBM System 360/65 Operator's Panel. OS/360 was used on most IBM mainframe computers beginning in 1966, including computers used by the Apollo program.
The first server for the World Wide Web ran on NeXTSTEP, based on BSD.