The IS tank family, developed by the Soviet Union during World War II, includes a series of heavy tanks designed to counter German armor. The most notable models are the IS-1, IS-2, and IS-3, which featured thick armor and powerful guns, making them effective on the battlefield. The IS tanks were named after Joseph Stalin, reflecting their significance in Soviet military strategy. The IS-2, introduced in 1944, was particularly famous for its 122mm gun, capable of destroying German tanks like the Tiger and Panther. The IS-3, unveiled in 1945, showcased a distinctive rounded turret and improved armor, influencing tank design in the post-war era.