Server (computing)

A computer network diagram of client computers communicating with a server computer via the Internet
First WWW server located at CERN with its original sticker that says: "This machine is a server. DO NOT POWER IT DOWN!!"

In computing, a server is a piece of computer hardware or software (computer program) that provides functionality for other programs or devices, called "clients". This architecture is called the client–server model. Servers can provide various functionalities, often called "services", such as sharing data or resources among multiple clients, or performing computation for a client. A single server can serve multiple clients, and a single client can use multiple servers. A client process may run on the same device or may connect over a network to a server on a different device.[1] Typical servers are database servers, file servers, mail servers, print servers, web servers, game servers, and application servers.[2]

Client–server systems are today most frequently implemented by (and often identified with) the request–response model: a client sends a request to the server, which performs some action and sends a response back to the client, typically with a result or acknowledgment. Designating a computer as "server-class hardware" implies that it is specialized for running servers on it. This often implies that it is more powerful and reliable than standard personal computers, but alternatively, large computing clusters may be composed of many relatively simple, replaceable server components.

  1. ^ Windows Server Administration Fundamentals. Microsoft Official Academic Course. 111 River Street, Hoboken, NJ 07030: John Wiley & Sons. 2011. pp. 2–3. ISBN 978-0-470-90182-3.CS1 maint: location (link)
  2. ^ Comer, Douglas E.; Stevens, David L (1993). Vol III: Client-Server Programming and Applications. Internetworking with TCP/IP. Department of Computer Sciences, Purdue University, West Lafayette, IN 479: Prentice Hall. pp. 11d. ISBN 978-0-13-474222-9.CS1 maint: location (link)

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