<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> In computing, a server is a computer program or a device that provides functionality for other programs or devices, called "clients". This architecture is called the client--server model, and a single overall computation is distributed across multiple processes or devices . 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 . Typical servers are database servers, file servers, mail servers, print servers, web servers, game servers, and application servers . </P> <P> 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 acknowledgement . 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 . </P>

Network architecture in which one or more high powered computers provide resources
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