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.[1]Services can be supplied centrally by the use of a server; in other cases all the machines on a network have the same status with no dedicated server, and services are supplied peer-to-peer.
Server Operating System
Some popular operating systems for servers — such as FreeBSD, Solaris, and Linux — are derived from or are similar to UNIX. UNIX was originally a minicomputer operating system, and as servers gradually replaced traditional minicomputers, UNIX was a logical and efficient choice of operating system for the servers. UNIX-based operating systems, many of which are free in both senses, are popular.
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