The Internet is an extension of a computer network originally formed in the United States during the 1960s by the Advanced Research Projects Agency (ARPA). Working under contract to the U.S. Department of Defense, ARPA initially connected computers at the Stanford Research Institute in California, the University of California at Los Angeles (UCLA), the University of California at Santa Barbara (UCSB), and the University of Utah. This original network, the very first computer network,
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site and have it delivered to their home or office. Companies doing business over the Internet must have very sophisticated security measures in place so that information such as credit card, bank account, and social security numbers cannot be accessed by unauthorized users (see Computer Security). Similarly, government facilities, universities, and institutions must ensure that access to their computers over the Internet is strictly regulated.
Encyclopedia Americana, 1993 ed.; MS Encarta 99; MS Bookshelf 95; Ask.com