The MiG-21 is a supersonic jet fighter aircraft developed by the Soviet Union in the 1950s. Known for its delta wing design, it became one of the most widely produced supersonic jets in history, with over 11,000 units built. The aircraft is primarily used for air-to-air combat and ground attack missions. Equipped with a single engine, the MiG-21 can reach speeds of over 2,000 kilometers per hour. It has been used by numerous countries around the world and has seen action in various conflicts. Its simplicity and effectiveness have made it a staple in many air forces.