A personal water craft (PWC) is a recreational watercraft that the rier sits or stands on, rather than inside of, as in a boat. Models have an inboard engine driving a pump jet that has a screw-shaped impeller to create thrust for propulsion and steering. They are often referred by the names WaveRunner, Jet Ski, or Sea-Doo, which are brand names owned by Yamaha, Kawasaki, and Bombardier, respectively.