Computer network

What is computer network?
A computer network is a group of computer systems and other computer hardware devices that are interconnected by communication channels to enable large numbers of users to communicate and share resources. Networks are usually categorized according to their properties.

One of the earliest examples of a computer network was a network of communicating computers that functioned as part of the U.S. military's SAGE (Semi-Automatic Ground Environment) radar system. In 1969, the University of California at Los Angeles, the Stanford Research Institute, the University of California at Santa Barbara, and the University of Utah were merged as part of the Advanced Research Projects Agency Network (ARPANET). This network became what we now call the Internet.

Networks are used to:

- Facilitate communication via email, video conferencing, instant messaging, etc.

- Allow multiple users to share a single hardware device such as a printer or scanner

- Enable file sharing across the network

- Enable the sharing of software or operating programs on remote systems

- Facilitate the access and maintenance of information between network users

-There are many types of networks including:

- Local networks (LAN)
- Personal Area Networks (PAN)
- Home Area Networks (HAN)
- Wide Area Networks (WAN)
- Campus networks
- Metropolitan Area Networks (MAN)
- Private corporate networks
- Internet works
- Backbone networks (BBN)
- Global Area Networks (GAN)
- The Internet

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