Jet drives use an engine to power a strong water pump. The pump sucks up water and then forces a jet of water out the back of the boat to thrust the boat forward. Directing this jet of water steers the boat.
Personal watercraft are the most common type of pleasure craft that use a jet drive.
Jet drives also may power larger boats (jet boats) and are used commonly for boats designed for shallow water conditions. Jet boats can have inboard or outboard jet drives.