A propulsion system is a technology that helps move vehicles, such as cars, airplanes, or rockets, by generating thrust. This system can use various energy sources, like gasoline, electricity, or rocket fuel, to create movement. The main goal is to push the vehicle forward, allowing it to travel from one place to another efficiently. Different types of propulsion systems exist, including internal combustion engines for cars and jet engines for airplanes. Each system has its own advantages and disadvantages, depending on the vehicle's design and purpose. Understanding these systems is essential for improving transportation and exploring new frontiers, like space travel.