A naval vessel is a type of watercraft designed for military purposes, primarily used by a country's navy. These ships can vary in size and function, including aircraft carriers, destroyers, submarines, and frigates. They are equipped with advanced technology and weaponry to perform various missions, such as combat, surveillance, and transportation of troops and supplies. Naval vessels play a crucial role in national defense and maritime security. They operate in international waters and can be deployed for humanitarian missions, peacekeeping, and disaster relief. The design and capabilities of these ships are often influenced by the strategic needs of the navy, such as those of the United States Navy or Royal Navy.