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A server is a computer program or a machine that waits for requests from other machines or software (clients) and responds to them. The purpose of a server is to share data or hardware and software resources among clients. This architecture is called the client–server model. The clients may run on the same computer or may connect to the server over a network.〔 〕 Typical computing servers are database servers, file servers, mail servers, print servers, web servers, game servers, and application servers.〔 〕 Server machines (which can be either actual or virtual machines) run server programs. In turn, a server program turns the machine on which it runs into a server machine. However, designating a machine as "server-class hardware" implies that it is more powerful and reliable than standard personal computers or is specialized for performing the server's role. Servers may be composed of large clusters of relatively simple, replaceable machines. ==Usage== The term ''server'' is used quite broadly in information technology. In theory, any computerized process that shares a resource to one or more client processes is a server. So, while the existence of files on a machine does not classify it as a server, if it uses some mechanism to share these files then it can be a file server. Similarly, web server software can be ''run'' on any capable computer, and so a laptop or personal computer can fulfill the role of a web server. In the hardware sense, the word ''server'' typically designates computer models specialized for their role. In a general sense, a server will perform its role better than a generic personal computer. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Server (computing)」の詳細全文を読む スポンサード リンク
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