A stern drive or inboard/outboard drive (I/O) is a form of marine propulsion. The engine is located inboard just forward of the transom (stern) and provides power to the drive unit (outdrive) [...]
A PWC (Personal Water Craft) is a small pleasure craft that uses an inboard jet drive as its primary source of propulsion and is designed to be operated by a person or persons sitting, standing, [...]
An outboard motor is a propulsion system for boats, consisting of a self-contained unit that includes engine, gearbox, and propeller or jet drive, designed to be affixed to the outside of the transom.