An outboard motor is a type of propulsion system used on boats. It consists of an engine, gearbox, and propeller all in one unit, which is mounted on the outside of the boat's transom. Outboard motors are popular for their ease of use, portability, and ability to provide power for various types of watercraft, from small fishing boats to larger recreational vessels. These motors can be powered by gasoline or electricity, with options ranging from small, lightweight models to larger, more powerful engines. Outboard motors are often favored for their simplicity in maintenance and the ability to easily remove them for storage or repair, making them a practical choice for many boaters.