Operating system
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An operating system (OS) is system software that manages computer hardware and software resources, and provides common services for computer programs.
The first server for the World Wide Web ran on NeXTSTEP, based on BSD.
Web server
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A web server is computer software and underlying hardware 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 page or other resource using HTTP, and the server responds with the content of that resource or an error message. A web server can also accept and store resources sent from the user agent if configured to do so.
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