The Canadian Security Intelligence Service (CSIS) is an intelligence agency responsible for national security in Canada. It is also known as the Canadian intelligence service, Canadian spy agency, and Canadian intelligence gathering agency. Other synonyms include Canadian spy network, Canadian counterintelligence agency, Canadian domestic intelligence agency, Canadian covert intelligence agency, and Canadian intelligence community. CSIS collects, analyzes, and disseminates intelligence on threats to national security, including terrorism, espionage, and foreign interference. It also provides security screening assessments for the government and conducts investigations related to security breaches. With its robust mandate, CSIS plays a crucial role in safeguarding Canada's national interests and protecting the safety of its citizens.