Marine vehicles are specialized types of transportation designed for travel on water. They include a variety of crafts such as boats, ships, and submarines, each serving different purposes. Boats are typically smaller and used for recreational activities or fishing, while ships are larger and often used for commercial transport of goods and passengers. Submarines are unique marine vehicles that can operate underwater, primarily used by military forces and for research purposes. All marine vehicles are built to withstand the challenges of water environments, including waves, currents, and varying weather conditions, ensuring safe and efficient travel across oceans and rivers.