The Mikoyan-Gurevich 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, featuring a maximum speed of around Mach 2. This aircraft has been used by numerous countries and has seen action in various conflicts worldwide. Its versatility and relatively low cost made it a popular choice among many air forces, contributing to its long service life and continued relevance in military aviation.