Surface ships are vessels that operate on the water's surface, as opposed to submarines, which travel underwater. They are designed for various purposes, including transportation, military operations, and research. Common types of surface ships include cargo ships, tankers, and naval vessels like destroyers and aircraft carriers. These ships are equipped with various technologies, such as navigation systems and communication equipment, to ensure safe and efficient travel. Surface ships can vary significantly in size and capability, from small fishing boats to large cruise liners and military fleets, each serving specific functions in maritime activities.