Computer Networks

Computer network was a system that consists of computers and other network devices that work together to achieve a common purpose.

The purpose of the computer network are:

Dividing resources: for example the use of shared printers, CPUs, memory, hard drive.
Communication: eg electronic mail, instant messaging, chat
Access to information: for example web browsing.

In order to achieve the same goal, every part of the request and provide computer network services (service). Parties who request a service called the client (client) and that provides service is called servant (the server). This architecture is called client-server system, and used on almost all computer network applications.

Source : www.wikipedia.com