Surveillance:The continuous monitoring and collection of information about individuals or groups suspected of involvement in terrorist activities, often through electronic means such as wiretapping, internet monitoring, and video surveillance.
Intelligence Gathering: The process of collecting, analyzing, and disseminating information about potential terrorist threats, including their plans, capabilities, and funding sources, to support counter-terrorism efforts.
Counterintelligence: The activities undertaken to identify, neutralize, and exploit the intelligence-gathering efforts of terrorist organizations, preventing them from obtaining sensitive information that could be used to plan and execute attacks.