COMPUTER NETWORKS

Network means Interconnection. A computer Network is interconnection between two or more autonomous computers or computer like devices.
                   OR 
A computer network, often simply referred to as a network, is a collection of computers and devices connected by communications channels that facilitates sharing of resources like information, hardware,files, etc.


PURPOSE



Computer networks can be used for several purposes:

• Facilitating communications. Using a network, people can communicate efficiently and easily via e-mail, instant messaging, chat rooms, telephone, video telephone calls, and video conferencing.
• Sharing hardware. In a networked environment, each computer on a network can access and use hardware on the network. Suppose several personal computers on a network each require the use of a laser printer. If the personal computers and a laser printer are connected to a network, each user can then access the laser printer on the network, as they need it.
• Sharing files, data, and information. In a network environment, any authorized user can access data and information stored on other computers on the network. The capability of providing access to data and information on shared storage devices is an important feature of many networks.
• Sharing software. Users connected to a network can access application programs on the network.

A computer network is a system in which computers are connected to share information and resources. The connection can be done as peer-to-peer or client/server.