The S.E.5 was a British fighter aircraft used during World War I. Designed by Sir Geoffrey de Havilland, it first flew in 1916 and became one of the most successful fighters of the war. The aircraft was known for its speed, maneuverability, and firepower, featuring a powerful Vickers machine gun and a robust airframe. The S.E.5 played a crucial role in the air battles of the war, helping to establish air superiority for the Royal Flying Corps. Its design allowed for easy handling, making it popular among pilots. The aircraft remained in service until the early 1920s, contributing to the evolution of military aviation.