An electromagnetic pulse (EMP) is a short burst of electromagnetic energy interference caused by an abrupt and rapid acceleration of charged particles, which can damage electronic components by short-circuiting them. An EMP can contain many energy components of the electromagnetic spectrum, from the very low frequency waves to the ultraviolet...
The Advanced Research Projects Agency (ARPA) was the old name for the Defense Advanced Research Projects Agency (DARPA), an agency of the U.S. government responsible for developing new technology for the military. In computing, ARPA/DARPA is best known for its involvement in networking and the early development of ARPANET, a network that many view as the starting point of the Internet.
ARPA changed its name to DARPA in 1972, then back to ARPA in 1993, then finally back again to DARPA in 1996. Its name change also sometimes causes confusion in the naming of ARPANET, who some assume changed its name to DARPANET, which is not the case.
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