Mi5, also known as the Security Service, is the United Kingdom’s domestic intelligence agency responsible for national security and counter-espionage. Its primary objective is to identify and prevent threats to the country’s internal security and safety, including espionage, terrorism, and cyber crime. Founded in 1909, Mi5 operates within the boundaries of British law and parliamentary oversight to protect national interests from both external and internal threats. Its work is highly classified, and its agents operate both in the UK and overseas to gather intelligence, analyze threats, and provide actionable information to government decision-makers. Through its vigilance and effectiveness, Mi5 plays a vital role in safeguarding the United Kingdom’s security and its citizens.