Heavy tank
The Char 2C was one of the largest tanks ever produced. At the start of World War II, France and the Soviet Union were the only countries to have inventories of heavy tanks, such as the Char B1, T-35, and KV-1. The Matilda II was designed under the British infantry tank concept which is similar to the heavy tank having thick armor and weighing more than their other tanks. It’s usually separate because they have less firepower with their cruiser tanks (comparable to mediums) at the time having the same main armament but more machine guns. Later war examples were the German Tiger I and II, as well as the Soviet IS series. Note that "heavy" versus "medium" is more a question of tactical roles than weight; the Panther, for example, was a "medium" tank that outweighed most Allied "heavy" tanks.
German tanks in World War II
Even larger and heavier than the Tiger I, the Pzkpfw VIB Tiger II. It is also known under the informal name Königstiger (the German name for the "Bengal tiger"), often semi-literally translated as the King Tiger or Royal Tiger by Allied soldiers. It was the largest tank mass-produced by German forces during the war, and remains among the heaviest mass-produced tanks ever. Its 8.8 cm KwK 43 could virtually knock out every Allied tank, while its sloped armor was thick enough to defeat most Allied guns (excluding hollow charge weapons). However, the Tiger II suffered from multiple mechanical problems due to its rushed development and excessive weight. It was named after the Tiger but it was a combination of innovations learned from the Panther and Tiger I.