The Panzerkampfwagen IV, commonly known as the Panzer IV, is a German medium tank developed in the late 1930s and used extensively during the Second World War. Its ordnance inventory designation was Sd.Kfz. 161.
A Panzer IV Ausf. G "413" in desert colours, bearing the palm tree insignia of the Afrika Korps, «Friederike» inscribed in Fraktur script on the gun barrel near the mantlet
Panzer IV Ausf. A in 1939
Panzer IV Ausf. C, 1943
Panzer IV Ausf. D in 1940. In addition to armour upgrades, the bow machine gun was re-introduced.
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 off of 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 were all medium tank designs. Many of the medium tank lines became what are called main battle tanks in most countries.
A Soviet T-34-85 medium tank
The German Panzer IV medium tank proved to be an adaptable design which was progressively upgraded during the Second World War with extra armour and better guns fitted
Sherman medium tank from World War II, the workhorse of U.S. armoured forces
American M46 Patton medium tank in the Korean War.