Server
In net jargon, a 'server' is a computer that serves many things to user, or client machines. Usually a server will only do a few things. Every type of thing a server does is called a service. Services are used by other computers that are called clients. The relationship between the client and the server is called a client-server relationship. For example, Wikipedia has a web server which has a service for sending web pages over the Internet. Your client computer talks to the Wikipedia's web page service to get web pages for you. A server can also host internet games and allow file sharing. In simple words, the individual computers are connected to some powerful computers called servers.