Counter-terrorism incorporates the practice, military tactics, techniques, and strategy that government, military, law enforcement, business, and intelligence agencies use to combat or prevent terrorism.
Military tactics are the science and art of organizing a military force, and the techniques for combining and using weapons and military units to engage and defeat an enemy in battle.
The National Counterterrorism Center by Office of the Director of National Intelligence
Counter-terrorism strategies include attempts to counter financing of terrorism.
Counter Terrorism Exercise by Singapore Police Force
If terrorism is part of a broader insurgency, counter-terrorism may employ counter-insurgency measures.
According to the U.S. Government Counterinsurgency Guide counter-insurgency or counterinsurgency "may be defined as ‘comprehensive civilian and military efforts taken to simultaneously defeat and contain insurgency and address its root causes’".
An insurgency is a rebellion against authority when those taking part in the rebellion are not recognized as belligerents.
The United States Armed Forces use the term foreign internal defense for programs that support other countries in attempts to suppress insurgency, lawlessness, or subversion or to reduce the conditions under which these threats to security may develop.
Foreign internal defense is a term used by a number of Western nations, including the United States, France and the United Kingdom, to describe an integrated and synchronized, multi-disciplinary approach to combating actual or threatened insurgency in a foreign state.