The Panzer IV was a German medium tank that was used extensively during World War II. It was initially designed as an infantry support tank, but it was later upgraded to become a more versatile fighting vehicle. The Panzer IV was known for its powerful 75mm gun, its reliable engine, and its good armor protection. It was used in all theaters of war, and it was particularly effective in the early stages of the war, where it faced less formidable opposition. However, as the war progressed, the Panzer IV was increasingly outmatched by Allied tanks, such as the M4 Sherman and the T-34.