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What is Internet ?

The Internet has revolutionized the computer and communications world like nothing before. The invention of the telegraph, telephone, radio, and computer set the stage for this unprecedented integration of capabilities. The Internet is at once a world-wide broadcasting capability, a mechanism for information dissemination, and a medium for collaboration and interaction between individuals and their computers without regard for geographic location. The Internet represents one of the most successful examples of the benefits of sustained investment and commitment to research and development of information infrastructure. Beginning with the early research in packet switching, the government, industry and academia have been partners in evolving and deploying this exciting new technology

Why was the Internet invented?

The Internet evolved from ARPANET (Advanced Research Projects Agency Network), an effort supported by the United States Department of Defense. The developers of ARPANET wanted to make communication between separate computer systems at various universities and research laboratories more convenient. 
Contrary to popular belief, while the Internet was designed to survive the loss of various parts of the network, it was never intended to survive a nuclear war. See the Wikipedia ARPANET entry for more information about this urban legend.

When Internet is Invented?

ARPANET adopted TCP/IP on January 1, 1983, and from there researchers began to assemble the “network of networks” that became the modern Internet. The online world then took on a more recognizable form in 1990, when computer scientist Tim Berners-Lee invented the World Wide Web.
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