The internet is a disparate mix of interconnected computers, many of them on large networks run by universities, businesses and so on. What unites this network of networks are the communication languages known as the Transmission Control Protocol and the Internet Protocol, collectively TCP/IP. There are also a few large networks that use different protocols and which remain largely isolated from the internet, including something called FidoNet, which links bulletin board systems. (source: newscientist.com)
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