ARPA (Advanced Research Projects Agency) is a term used primarily in the field of technology and government related projects. ARPA is synonymous with DARPA, which stands for Defense Advanced Research Projects Agency, and both terms refer to the same agency within the United States Department of Defense. Other synonyms for ARPA include ARPANET, a precursor to the internet, and the Internet, as both were created by the agency in question. Additionally, other related synonyms include Cyber Command and the Strategic Capabilities Office, which focus on cybersecurity and emerging technologies, respectively. Overall, ARPA is an important government agency in the field of technology and innovation.