Internet

=Internet= The Internet is a computer-based communication network sharing a common protocol called TCP/IP. Its main purpose is to allow certain services to be possible. Some of these are:
 * Email
 * File transfer
 * Real time chat
 * World Wide Web
 * Video and Audio streaming services
 * VoIP telephone service

= Intranet = The characteristics of an Intranet are almost the same as the Internet. It uses the TCP/IP protocol to allow internal computers to communicate with one another. Intranet runs over Local Area Network (LAN) and for larger organisations Wide Area Network(WAN). For organisations with branches around the world they use 'virtual network'. On top of the Internet technology there will be a username - password system in place to authorise access.

Advantages of Intranet

 * Commercial data is kept secure
 * Emails remain private and can also be encrypted
 * High bandwidth. No connection limits unlike Internet
 * Reliable. The company will have dedicated IT personnel to keep things running smoothly

= Extranet = Extranet is one where people from outside the organisation can connect to the internal Intranet.

(All from //www.teach-ict.com//)

Here's how...
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