The IS-3 is a Soviet heavy tank that was developed during World War II and first saw combat in 1945. It is known for its distinctive rounded turret and sloped armor, which provided excellent protection against enemy fire. The tank was equipped with a powerful 122mm gun, making it effective against both armored vehicles and fortifications. The IS-3 was designed to counter the threat posed by German tanks, such as the Tiger II. Its advanced design influenced future tank development and served as a model for later Soviet tanks, including the T-54 and T-55. The IS-3 remains an iconic symbol of Soviet armored warfare.