Client-server computing describes one level of interaction found between computers in systems architecture.

A server is a machine that is dedicated to providing a particular function or service requested by a client within a network system.

Servers can range in power from ‘top-end’ super servers, capable of driving thousands of network users, to ‘low-end’ servers which are typically a powerful personal computer (PC). Different types of servers might include file servers, network servers, print servers, e-mail servers and fax servers.

File servers are used to manage the data files that are accessible to users of the network. All the shared data files for the system are held on a file server, or are accessible through a file server.

Network servers are used to route messages from terminals and other equipment in the network to other parts of the network. In other words, network servers manage and control the routing of messages within computer networks.