The "Kaiser-class" refers to a series of battleships built for the Imperial German Navy during World War I. These ships were designed to be heavily armed and armored, featuring advanced technology for their time. The class included notable ships like the SMS Kaiser and SMS Friedrich der Große, which were intended to challenge the naval power of the Royal Navy. Kaiser-class battleships were characterized by their large size and powerful main guns, typically mounted in turrets. They played a significant role in naval engagements, although their effectiveness was limited by the changing nature of warfare and the rise of aircraft and submarines.