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ARPANET, in full Advanced Research Projects Agency Network, experimental computer network that was the forerunner of the Internet.
- The Advanced Research Projects Agency (ARPA), an arm of the U.S. Defense Department, funded the development of the Advanced Research Projects Agency Network (ARPANET) in the late 1960s.
- Its initial purpose was to link computers at Pentagon-funded research institutions over telephone lines.
Source: Britannica.com