The Advanced Research Projects Agency Network, the precursor to the modern internet developed by the U.S. Department of Defense in the 1960s.
From ARPA (Advanced Research Projects Agency, now DARPA) + network. Created as an acronym in 1969 when the U.S. military wanted to build a decentralized communication system that could survive nuclear war.
ARPANET sent its first message in 1969 from UCLA to Stanford—that simple 'LO' (intended to spell 'LOGIN') launched the network revolution that became the internet, making it one of history's most consequential typos.
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