The T-55 is a Soviet-designed main battle tank that was first produced in the late 1950s. It is an evolution of the earlier T-54 model and features improved armor, a more powerful engine, and a 100mm gun. The T-55 was widely exported and used by many countries during the Cold War, making it one of the most common tanks in history. This tank is known for its reliability and ease of maintenance, which contributed to its long service life. Variants of the T-55 have been adapted for various roles, including command, recovery, and armored bridge layers, showcasing its versatility on the battlefield.