Activity to defend against or prevent terrorist actions / From Wikipedia, the free encyclopedia

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Counterterrorism (also spelled counter-terrorism), also known as anti-terrorism, incorporates the practices, military tactics, techniques, and strategies that governments, law enforcement, businesses, and intelligence agencies use to combat or eliminate terrorism. Counterterrorism strategies are a government's motivation to use the instruments of national power to defeat terrorists, the organizations they maintain, and the networks they contain.[1]

GIGN operators in 2015. GIGN is the counterterrorist tactical unit of the National Gendarmerie of France.
A United States Coast Guard vessel conducting a counterterrorism patrol in the Upper New York Bay

If definitions of terrorism are part of a broader insurgency, counterterrorism may employ counterinsurgency measures. The United States Armed Forces uses the term foreign internal defense for programs that support other countries' attempts to suppress insurgency, lawlessness, or subversion, or to reduce the conditions under which threats to national security may develop.[2][3][4]