World War II fighters were military aircraft designed for air-to-air combat. These planes played a crucial role in the war, engaging enemy aircraft and providing air support for ground forces. Notable examples include the Supermarine Spitfire used by the British and the P-51 Mustang employed by the Americans. Fighter planes were equipped with advanced technology for their time, including powerful engines and machine guns. They were essential in achieving air superiority, which allowed for successful bombing missions and troop movements. The effectiveness of these fighters significantly influenced the outcome of battles throughout the war.