Server
Typical server operating systems are Linux, FreeBSD, NetBSD, and OpenBSD.  Unlike other computers, a server often has no monitor, keyboard, or mouse.  When a server doesn't have to do very much, server software can run on a computer that is also doing other things.Initially, such servers were connected to clients known as terminals that did not do any actual computing. These terminals, referred to as dumb terminals, existed simply to accept input via a keyboard or card reader and to return the results of any computations to a display screen or printer. The actual computing was done on the server. Servers also have a special ip number that other devices use to find the servers.