A network is a collection of computers connected to each other.
The network allows computers to communicate with each other and
share resources and information among the connected computers.

Computers on a network are sometimes called Nodes.
Computers and devices that allocate resources for a network are called Servers.

Types of Network
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1. Local-Area Networks (LANs) : The computers are geographically close together (that is, in the same building).
2. Wide-Area Networks (WANs) : The computers are farther apart and are connected by telephone lines or radio waves.
3. Campus-Area Networks (CANs): The computers are within a limited geographic area, such as a campus or military base.
4. Metropolitan-Area Networks MANs): A data network designed for a town or city.
5. Home-Area Networks (HANs): A network contained within a user’s home that connects a person’s digital devices.
6. Global Area Networks (GANs): GAN is a model for supporting mobile communications across an arbitrary number of wireless LANs, satellite coverage areas, etc.
7. Virtual Private Network ( VPNs ) : A computer network in which some of the links between nodes are carried by open connections or virtual circuits in some larger network (e.g., the Internet) instead of by physical wires. A VPN allows computer users to appear to be editing from an IP address location other than the one which connects the actual computer to the Internet.

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