1. A program which provides some service to other (client)

programs. The connection between client and server is

normally by means of message passing, often over a network,

and uses some protocol to encode the client's requests and

the server's responses. The server may run continuously (as a

daemon), waiting for requests to arrive or it may be invoked

by some higher level daemon which controls a number of

specific servers (inetd on Unix). There are many servers

associated with the Internet, such as those for Network FileSystem, Network Information Service (NIS), Domain NameSystem (DNS), FTP, news, finger, Network TimeProtocol. On Unix, a long list can be found in /etc/services

or in the NIS database "services". See client-server.