A kayak is a small, narrow boat that is propelled by a double-bladed paddle. Kayaks typically have a covered deck and an open cockpit, and they can be made from various materials such as plastic, fiberglass, or wood. Kayaking is a popular recreational activity and sport, and kayaks can be used for a variety of purposes such as touring, whitewater paddling, fishing, and even long-distance expeditions. Kayaks can be closed or open deck and can be used in both calm and rough waters.