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.
Tank destroyer
Although the early German "Panzerjäger" carried more effective weapons than the tanks on which they were based, they were generally lacking in protection for the crew, having thinly armored open-topped superstructures. The "open-topped" design format of the "Panzerjäger" vehicles was succeeded by the "Jagdpanzer" '("hunting tanks"), which mounted the gun in true casemate-style superstructures, completely enclosing the crew compartment in armor that was usually integral to the hull. The first of these "Jagdpanzer"s was the 70-ton "Ferdinand" (later renamed "Elefant"), based on the chassis, hulls, and drive systems of ninety-one Porsche VK4501 (P) heavy tanks, mounting a long-barreled 88 mm cannon in an added casemate, more like the earlier "Panzerjägers" had with their added-on armor shielding for the gun crew, but in the "Ferdinand" completely enclosing the gun and firing crew in the added casemate, as the later purpose-built "Jagdpanzers" would. However, the "Ferdinand" was mechanically unreliable and difficult to maneuver, and once all ninety-one unturreted "Porsche Tiger" hulls/drive systems were converted, no more were built. The German Army had more success with the Jagdpanther. Introduced in mid-1944, the Jagdpanther, of which some 415 examples were produced, was considered the best of the casemate-design Jagdpanzer designs. It featured the same powerful PaK 43 88 mm cannon used on the unwieldy "Elefant", now fitted to the chassis of the medium Panther tank, providing greatly improved armor-penetrating capability in a medium-weight vehicle.
Facing an increasingly defensive war, the German Army turned to larger and more powerfully armed Jagdpanzer designs, and in July 1944 the first "Jagdtiger" rolled off the production line; it was the heaviest German armored fighting vehicle to go into active service. The "Jagdtiger" featured a huge 128 mm PaK 44 cannon and heavy armor protection. Only 88 "Jagdtiger" vehicles were produced, barely matching the total number of the earlier Ferdinand/Elefant vehicles. They were first deployed to combat units in September 1944.