HISTORY OF INTERNET
In 1991, a network evolved out of an experiment done by the defence agency of United States. The Department of Defence was in a process of doing research and technical developent in the areas where some of the services of defence (Army, Navy, Air force, Marine crops) had clear jurisdiction of operation.
This agency, ARPA (Advanced Research Project Agency), which was later known as DARPA (Defence Advanced Research Project Agency), planned to create a continue to operate even during the emergency or disastrous situations like war.
This had led to the development of ARPANET (Advanced Research Project Agency Network) which work to link us scientific and Academic Researchers for exchanging data and messages between one computer to another ARPANET started as a four node network in December 1969.
By 1980's, another federal agency of US named as National Science Foundation (NSF) used ARPANET to connect its five regional supercomputer centers located at different universities so that their multiple users could share the resources among themselves. Later, NSF created a more sophisticated network called NSFNET (National Science Foundation Network) which has a series of network that was utilized for research and development.
The link between ARPANET, NESNET and other networks was termed as Internet.
(The process of connecting separate networks with each other is called internetworking. A collection of 'networked networks' is described as being inter-networked that is from where the 'Internet' gets its name).
Initially, NSFNET was meant only for the purpose of academic research and was not in use for any private organization. As NSFNET did not permit its use to private organization, several private telecommunication companies built their own network backbones that used the same set of networking protocols as NSFNET used.
The original ARPANET lost its existence in 1990 and the government discontinued funding to NSFNET in 1995. The commercial internet services replaced them. By early 1990's, internet expanded dramatically and the tool which was made for communication during wars found its way into general and commercial usage (i.e., business, home, education, etc).
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