A gasoline engine is a type of internal combustion engine that converts fuel into mechanical energy. It works by igniting a mixture of gasoline and air in a cylinder, which creates a small explosion. This explosion pushes a piston, turning the crankshaft and ultimately powering a vehicle or machinery. Gasoline engines are commonly found in cars, motorcycles, and small equipment. They are known for their relatively simple design and ability to start quickly. However, they also produce emissions, which can contribute to air pollution, leading to the development of more environmentally friendly alternatives like electric engines.