German battleships were powerful warships used primarily during the late 19th and early 20th centuries. They played a significant role in naval warfare, particularly during World War I. Notable classes included the Kaiser-class and Bismarck-class, which were designed for heavy firepower and armor to engage enemy fleets. These battleships were equipped with large-caliber guns and advanced technology for their time. The Bismarck, launched in 1939, became famous for its role in the Atlantic during World War II. However, advancements in naval warfare, such as aircraft carriers and submarines, eventually rendered traditional battleships less effective.