Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The predecessor of the Internet was a project created by the United States Department of Defense in the late 1960s. Called the ARPANET (Advanced Research Projects Agency Network), it was first developed by DARPA (Defense Advanced Research Projects Agency; at the time simply named ARPA). The Internet, which grew out of this initial project, first gained a public face in the 1990s.

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