When were fighter jets first used in war?

Fighter jets were first used in war during World War II. The Royal Air Force's Supermarine Spitfire and the German Messerschmitt Bf 109 were among the first dedicated fighter aircraft that played significant roles in aerial combat. However, the first instance of jet-powered fighters in combat occurred later, with the German Me 262 entering service in 1944. This marked a significant advancement in aerial warfare technology.