German Armour

Nazi Germany developed numerous tank designs during World War II. In addition to domestic designs, Germany also employed various captured and foreign-built tanks. By doing this Germany saw their tanks grow from "tiny five ton packages to one hundred-ton monsters".
The German tank force was an amazing success due to tactical innovation more than tank quality.

Using Blitzkrieg tactics, Guderian, Paul Ludwig Ewald von Kleist and other field commanders such as Rommel broke the hiatus of the Phoney War in a manner almost outside the comprehension of the Allied — and, indeed, the German — High Command. In actual tank-on-tank encounters the German armor performed poorly, but as a coherent unit, the combined arms tactic of the Blitzkrieg shocked the Allies.

The German Panzer force at the start of World War II was not especially impressive. Only 4% of the defense budget was spent on armored fighting vehicle (AFV) production. Guderian had planned for two main tanks: the Panzer III, which was in production; and the Panzer IV with a 75 mm gun, which was not. The design work for the Panzer IV had begun in 1935 and trials of prototypes were undertaken in 1937, but by the time of the invasion of Poland only a few hundred 'troop trial' models were available. The development work was then halted and limited production was begun by Krupp in Magdeburg (Grusonwerk AG), Essen and Bochum in October 1939 with 20 vehicles built. However, even that low number could not be sustained, with production dropping to ten in April 1940. Production also dropped because metal was very expensive and not many citizens were donating it.

Source: en.wikipedia.org/wik..anks_in_World_War_II