Heavy tank in the context of "Super-heavy tank"

The Tiger I (German: [ˈtiːɡɐ] ) was a German heavy tank of World War II that began operational duty in 1942 in Africa and in the Soviet Union, usually in independent heavy tank battalions. It gave the German Army its first armoured fighting vehicle that mounted the 8.8 cm (3.5 in) KwK 36 gun (derived from the 8.8 cm Flak 36, the famous "eighty-eight" feared by Allied troops). 1,347 were built between August 1942 and August 1944. After August 1944, production of the Tiger I was phased out in favour of the Tiger II.

While the Tiger I has been called an outstanding design for its time, it has also been criticized for being overengineered, and for using expensive materials and labour-intensive production methods. In the early period, the Tiger was prone to certain types of track failures and breakdowns. It was expensive to maintain, but generally mechanically reliable. It was difficult to transport and vulnerable to immobilisation when mud, ice, and snow froze between its overlapping and interleaved Schachtellaufwerk-pattern road wheels, often jamming them solid.

A main battle tank (MBT), also known as a battle tank, is a tank that fills the role of armour-protected direct fire and maneuver in many modern armies. Cold War-era development of more powerful engines, better suspension systems and lighter composite armour allowed for the design of a tank that had the firepower of a super-heavy tank, the armour protection of a heavy tank, and the mobility of a light tank, in a package with the weight of a medium tank. The first designated MBT was the British Chieftain tank, which during its development in the 1950s was re-designed as an MBT. Throughout the 1960s and 1970s, the MBT replaced almost all other types of tanks, leaving only some specialist roles to be filled by lighter designs or other types of armoured fighting vehicles.

Main battle tanks are a key component of modern armies. Modern MBTs seldom operate alone, as they are organized into armoured units that include the support of infantry, who may accompany the tanks in infantry fighting vehicles. They are also often supported by surveillance or ground-attack aircraft. The average weight of MBTs varies from country to country. The average weight of Western MBTs is usually greater than that of Russian or Chinese MBTs.

A medium tank is a classification of tanks, particularly prevalent during World War II, which represented a compromise between the mobility oriented light tanks and the armour and armament oriented heavy tanks. A medium tank's classification is not actually based on weight, but on tactical usage and intended purpose; for instance the German Panzerkampfwagen V Panther medium tank has a mass similar to contemporary Allied heavy tanks. The most widely produced, cost effective and successful tanks of World War II (the German Panzer IV, the Soviet T-34, and the American M4 Sherman) were all medium tank designs. Many of the medium tank lines became what are called main battle tanks in most countries.

The Tiger II was a German heavy tank of the Second World War. The final official German designation was Panzerkampfwagen Tiger Ausf. B, often shortened to Tiger B. The ordnance inventory designation was Sd.Kfz. 182. (Sd.Kfz. 267 and 268 for command vehicles). It was also known informally as the Königstiger (German for Bengal tiger, lit. 'King Tiger'). Contemporaneous Allied soldiers often called it the King Tiger or Royal Tiger.

The Tiger II was the successor to the Tiger I, combining the latter's thick armour with the armour sloping used on the Panther medium tank. It was the costliest German tank to produce at the time. The tank weighed almost 70 tonnes and was protected by 100 to 185 mm (3.9 to 7.3 in) of armour to the front. It was armed with the long barrelled (71 calibres) 8.8 cm KwK 43 anti-tank cannon. The chassis was also the basis for the Jagdtiger turretless Jagdpanzer anti-tank vehicle.

The VK 45.01 (P), also informally known as Tiger (P) or Porsche Tiger, was a heavy tank prototype designed by Porsche in Germany. With a dual engine gasoline-electric drive that was complex and requiring significant amounts of copper, it lost out to its Henschel competitor on trials, it was not selected for mass production and the Henschel design was produced as the Tiger I. Most of the already produced chassis were rebuilt as Elefant Panzerjäger tank destroyers.

The FV4201 Chieftain was the primary main battle tank (MBT) of the United Kingdom from the 1960s into the 1990s. Introduced in 1967, it was among the most heavily armed MBTs at the time, mounting a 120 mm Royal Ordnance L11 gun, equivalent to the much larger specialist heavy tanks in service. It was also among the most heavily armoured, with up to 195 mm (7.7 in) that was highly sloped to offer 388 mm (15.3 in) thickness along the line of sight.

A development from the Centurion MBT, the Chieftain introduced the supine (reclining) driver position to British design allowing a heavily sloped hull with reduced height. A new powerpack and improved transmission gave it higher speed than the Centurion despite being heavier due to major upgrades to armour protection and the armament; this allowed it to replace both the Centurion and Conqueror heavy tank while performing their roles effectively.