counterintelligence

A counterintelligence unit is a group that collects and uses information about someone else's plans or secrets for their own advantage. They often work secretly to stop people who might try to harm them.

These units are most commonly used by governments, especially when it comes to national security. Imagine you're in charge of protecting your country from spies or terrorists - that's what a counterintelligence unit does. They might listen in on conversations, follow suspects, and gather information about potential threats. The goal is usually to stay one step ahead of the people trying to cause harm.