An engine is a machine that converts fuel into motion. It powers many vehicles, such as cars, trucks, and airplanes, allowing them to move. Most engines work by burning fuel, like gasoline or diesel, to create energy. This energy pushes pistons, which then turn the wheels or propellers, making the vehicle go. There are different types of engines, including internal combustion engines and electric engines. Internal combustion engines use fuel, while electric engines run on electricity stored in batteries. Both types are essential for modern transportation, helping people travel and goods to be delivered efficiently across the world.