A computer network is two or more computers connected together. Computers in a network can communicate with each other. A computer needs some sort of hardware to connect to a network, e.g. a network interface card, or a modem. There are two types of computer network: Local Area Networks (LANs): computers connected over a relatively small distance, usually one building or one site. Wide Area Networks (WANs): computers connected together over larger distances, such as all branches of a company. The Internet is a WAN. Computers on a network are called terminals.
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