The British Secret Service, officially known as the Secret Intelligence Service (SIS), is the United Kingdom's foreign intelligence agency. Its primary role is to gather intelligence from outside the UK to support national security and foreign policy objectives. The agency operates under the authority of the Foreign, Commonwealth & Development Office and works closely with other intelligence organizations, including MI5 and GCHQ. Founded in 1909, the SIS has played a crucial role in various historical events, including both World Wars and the Cold War. Its agents often work undercover to collect information on potential threats, espionage activities, and terrorist organizations, ensuring the safety of the UK and its allies.