Purpose of a computer network

Computer networks exist to exchange data that is stored in one computer with another one. For example when you read email at Gmail, or Yahoo, or alike service, all of the emails are stored in a server computer (to handle this much data there is probably more than one server), that data is exchanged with your computer which is client in this case.

Exchanging data from a client to a server is probably number one reason why computer network exists. There may be more then one client, therefore storing data on a server is an effective way to exchange this data with an another computer user.

I explained client-server communication, however it is possible to establish direct connection between more than one client computer avoiding a need for a server altogether. In this principal pear-to-pear networking or communication work.

Computer networks can be different sizes. There could be a computer network that covers a small area, a bigger one that helps to establish communication between two buildings that are located at a significant distance from each other.

There is also VPN (Virtual Private Network). VPN communication is a secure communication between computers.

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