A server is a computer program that provides services to other computer programs (and their users), in the same or other computer. The physical computer that runs a server program is also often referred to as server.
Server is also used as a designation for computer models intended for use in running server applications under heavy workloads, also called operating units often unattended and for an extended period of time. While any workstation computer is capable of acting as a server, a server computer usually has special features intended to make it more suitable.
Server is the unit that builds up some network. Internet is based on servers physically connected to each other. Main role is to serve the users (software: like browsers) by giving the needed set of data or redirecting to the appropriate server.

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