The Mikoyan MiG-21 is a supersonic jet fighter developed by the Soviet Union in the 1950s. Known for its delta wing design, it became one of the most widely produced supersonic aircraft in history, with over 11,000 units built. The MiG-21 was designed for air superiority and ground attack missions, and it has been used by numerous countries around the world. Equipped with a single engine, the MiG-21 can reach speeds of over Mach 2. It features a simple cockpit layout and is relatively easy to maintain, contributing to its long service life. The aircraft has seen action in various conflicts and remains in use in some air forces today.