A thruster is a type of propulsion device used to generate thrust, which is the force that moves an object in a specific direction. Thrusters are commonly found in spacecraft, submarines, and some types of boats. They can be powered by various means, including electric motors, chemical reactions, or jet propulsion, and are essential for maneuvering and controlling the movement of vehicles in water or space. In spacecraft, thrusters help with navigation and attitude control, allowing for precise adjustments in position and orientation. Different types of thrusters, such as ion thrusters and chemical thrusters, serve specific purposes based on the mission requirements. Overall, thrusters play a crucial role in modern transportation technologies.