A jet ski is an aqua-motorcycle that is designed for recreational usage on water. This device is also known by different names such as waverunner, sea-doo, watercraft, and personal watercraft. All of these terms refer to the same type of water vehicle that is propelled by waterjets. A waverunner is a product sold by Yamaha, while sea-doo is a term used by the Bombardier Recreational Products company. Watercraft is a broader term that might include boats, rowing and sailing crafts. Personal watercraft refers explicitly to the types of recreational vehicles that feature a seated rider and a handlebar to control the vehicle.