1.
Internet
Internet is a computer network that is based on
TCP/IP which connects computers around the world. In the Internet, there is a
Web server that provides programs and data on one side, and on another side
there is a client that is equipped with browser to access the web server.
2.
Intranet
Intranet is a local network that is based on
TCP/IP which connects computers in a local area in a building, a school, a
campus, or in a company. Thus, Intranet is internet technology used in a local
scope.
3.
Virtual Private Network (VPN)
VPN or extranet is a private network (of a
company) which is based on TCP/IP using internet and public telecommunication connection to share
some information. For example, a company with branch offices in all cities has
intranet in each of the offices. VPN connects the intranet of
all branch offices using public internet connection, but forms a company private
connection.
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