Operating system
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An operating system is system software that manages computer hardware and software resources, and provides common services for computer programs.
IBM System/360 Model 50 operator's console and CPU; the operator's console is a terminal used by the operating system to communicate with the operator.
Web server
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A web server is computer software that accepts requests via HTTP or its secure variant HTTPS. A user agent, commonly a web browser or web crawler, initiates communication by making a request for a web
The inside and front of a Dell PowerEdge server, a computer designed to be mounted in a rack mount environment. Servers similar to this one are often used as web servers.
Multiple web servers may be used for a high-traffic website.
Server farm with thousands of web servers used for super-high traffic websites
ADSL modem running an embedded web server serving dynamic web pages used for modem configuration