Introduction to Computer Networking

A Computer Network, often simply referred to as a Network, is a group of computers and devices interconnected by communication channels that facilitate communications among users and allows users to share resources and information.

In computer networks, networked computing devices pass data to each other along data connections. Network computer devices that originate, route and terminate the data are called network nodes. The connections (network links) between nodes are established using either cable media or wireless media.

The best-known computer network is the Internet.

In the 1960s, the Advanced Research Projects Agency (ARPA) started funding the design of the Advanced Research Projects Agency Network (ARPANET) for the United States Department of Defense. It was the first computer network in the World.

Computer networks support applications such as:

1. Access to the World Wide Web
2. Shared use of application and storage servers, printers, and fax machines
3. Use of email and instant messaging applications

among many other uses.

The diagrammatic view of various components of a network constituting a network.
(Image Courtesy: http://www.meetup.com)

Following this, you might want to read about Relevance of Computer Networks or A general discussion over Network Design Criteria. You're welcome to follow those links to expand your knowledge. Take care :)