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A Jet ski (also referred to as PWC) is a recreational watercraft that the rider 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 brand names WaveRunner, Jet Ski, or Sea-Doo.

Most are designed for two or three people, though four-passenger models exist. Stand-up PWCs were first to see mass production and are popular for single riders. The invention of both major types of PWC is credited to Clayton Jacobson II of Arizona, originally a motocross enthusiast.

Many U.S. states require safety training for personal watercraft operators. Modern PWCs include a lanyard attached to a dead man's switch, to turn off the vessel if the operator falls off, provided the lanyard is attached to the operator. PWCs are small, fast, easily handled, fairly easy to use, affordable and their propulsion systems, which do not have external propellers, making them safer for swimmers and wildlife. For these reasons, they are preferred for non-recreational use over small motorboats.

Lifeguards use PWCs equipped with rescue platforms to rescue water users who get into difficulties and carry them back to shore. Rescuers use PWCs to pick up flood survivors. PWCs are used by biologists studying marine life. PWCs are also used for law enforcement. Due to their speed and excellent maneuverability, police and rangers use them to enforce laws on lakes and rivers.

The world record for the distance traveled on a PWC, set by John Moffatt in 2007, is 11,525 miles (18543 kilometers).