An outboard engine is a type of propulsion system used on boats, mounted externally at the rear. It combines the engine, gearbox, and propeller in one unit, making it easy to install and remove. Outboard engines are popular for their versatility, as they can power various types of watercraft, from small fishing boats to larger recreational vessels. These engines come in different sizes and power ratings, typically measured in horsepower. They can be powered by gasoline or electric sources, with modern models often featuring advanced technology for better fuel efficiency and reduced emissions. Outboard engines are essential for recreational boating and commercial fishing activities.