INTERNET(1969)

ADVANCED RESEARCH PROJECT AGENCY (ARPA) DEVELOPS THE FIRST COMPUTER NETWORK.

A Global computer network providing a variety of communication facilities and information consisting of interconnected network using standardized communication protocols. 

In 1963, the advanced research project agency unit, set up by the U.S defense department, began to build a computer network. Driven by fear of the soviet nuclear threat, it aimed to link computer at different location, so researchers could share data electronically without having fixed route between them, making the system less vulnerable to attack even nuclear ones.

Data was converted into telephone signals using modem, developed at AT&T, in the late 1950s. In the 1960s, key advance were made including "packet switching " the system of packaging, labeling, and routing data that enable it to be delivered across the network, between machines. Paul Baran  proposed this system, which broke each message down into tiny chunks. These would be fired into the network, which would then route the various pieces to the desired destination . so, if chunks of a message were travelling from Seattle to New York via Dallas, but Dallas suddenly went offline, the network would automatically route via Denver instead. Different parts or "packets" of a message would go by different route , before being reassemble back into original message at their destination, even if they arrived in wrong order. Baran published his concept in 1964, and five years later the new network called ARPANET went live.

As the threat of nuclear war receded in the early 1970s, ARPANET was renamed the internet and effectively opened to all users. Since then, the development of email, the creation of the world wide web, and browser technology has enabled the internet to become a rich communication facility.

the internet sometimes called "the net" change the life style of human beings. we can gather any information at any place at any time using internet