Why is a submarine called you-boat in German?

The term "U-boat" comes from the German Word "U-Boot," which is short for "Unterseeboot," meaning "undersea boat." This designation was used primarily during World War I and World War II to refer to German submarines. The "U" represents "Unter" (under), while "Boot" means "boat." The U-boats were notable for their role in naval warfare, particularly in the Battle of the Atlantic.