A system entity that requests and uses a service provided by another system entity, called a "server". (See: server.)
A system entity that requests and uses a service provided by another system entity, called a "server". (See: server.)
Tutorial: Usually, it is understood that the client and server are automated components of the system, and the client makes the request on behalf of a human user. In some cases, the server may itself be a client of some other server.