Tiger II in the context of "Panther 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 German heavy tank battalion (German: "schwere Panzerabteilung", short: "s PzAbt") was a battalion-sized World War II tank unit of the German Army during World War II, equipped with Tiger I, and later Tiger II, heavy tanks. Originally intended to fight on the offensive during breakthrough operations, the German late-war realities required it to be used in a defensive posture by providing heavy fire support and counter-attacking enemy armored breakthroughs, often organised into ad hoc Kampfgruppen (battlegroups).

The German heavy tank battalions destroyed a total of 8,100 enemy tanks for the loss of 1,482 of their own, an overall kill/loss ratio of 5.47 though individual unit ratios ranged from 1.28 to 13. The German losses also include non-combat tank write-offs.