Counterspies are individuals who are tasked with the responsibility of detecting and preventing espionage activities against their own country. The term counterspies can be used interchangeably with other synonyms such as secret agent, spy, intelligence officer, and undercover agent. A secret agent is a person who operates undercover on behalf of an intelligence agency. A spy is a person who secretly collects information about the activities of another country for their own use. An intelligence officer is a person who works in an intelligence agency and is responsible for gathering and analyzing information. An undercover agent is a person who operates undercover to infiltrate enemy territory and gather intelligence. All these terms are synonyms for counterspies and are used to describe individuals who work tirelessly to protect their own country from espionage activities.