The Oerlikon 20 mm Cannon is a Swiss-made autocannon designed for anti-aircraft and anti-vehicle applications. It fires 20 mm rounds at a high rate, making it effective against low-flying aircraft and light armored targets. The cannon is known for its reliability and ease of use, often mounted on ships, vehicles, and ground installations. Developed in the 1930s, the Oerlikon 20 mm Cannon has been widely used by various military forces around the world. Its design has influenced many subsequent autocannons, and it remains a popular choice for defense systems due to its versatility and performance in combat situations.