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A computer system in a network that is shared by multiple users. Servers come in all sizes from x86-based PCs to IBM mainframes. A server may have a keyboard, monitor and mouse directly attached, or one keyboard, monitor and mouse may connect to any number of servers via a switch (see KVM switch). In datacenters with hundreds and thousands of servers residing in equipment racks, all access is via the network. See server farm, blade server and rack mounted.

Any User's Machine Can Be a Server
Stand-alone PCs and Macs can also function as a server to other users on the network even though they serve as a single workstation to one user (see peer-to-peer). In such cases, specific folders are typically configured for sharing rather than the entire hard drive.

Servers Can Be Software Only
The term "server" may refer to both the hardware and software (the entire computer system) or just the software that performs the service. For example, a "Web server" may refer to a dedicated computer running Web server software or to Web server software running with other applications. Servers are classified by their purpose, and the following servers are defined in this encyclopedia.

            application server

            audio server

            database server

            fax server

            file server

            intranet server

            mail server

            media server

            merchant server

            modem server

            network access server

            print server

            proxy server

            remote access server

            server appliance

            telephony server

            terminal server

            video server

            Web server