Watercraft refers to any type of vessel or craft designed for travel on water. This includes boats, ships, submarines, and other types of vessels that are used for transportation, recreational activities, fishing, sailing, and exploration. Watercraft can be powered by various means such as sails, oars, engines, or even human power through rowing or paddling. The term encompasses a wide range of water-going vehicles that are used for different purposes on rivers, lakes, oceans, and other bodies of water.