A propulsion system is a mechanism that generates thrust to move an object, such as a vehicle or spacecraft. It converts energy into motion, allowing the object to travel through air, water, or space. Common types of propulsion systems include internal combustion engines, jet engines, and rocket engines, each designed for specific environments and applications. In vehicles, propulsion systems can be powered by various energy sources, including gasoline, diesel, electricity, or alternative fuels. The efficiency and effectiveness of a propulsion system are crucial for performance, fuel consumption, and environmental impact, influencing the design and technology used in modern transportation.