A thruster is a type of propulsion device used to move vehicles, particularly in space or underwater. It generates thrust by expelling mass in one direction, which propels the vehicle in the opposite direction, following Newton's third law of motion. Thrusters can be found in spacecraft, submarines, and remotely operated vehicles, allowing for precise maneuvering. There are various types of thrusters, including chemical thrusters, ion thrusters, and electric thrusters. Each type operates on different principles and is suited for specific applications. For example, ion thrusters are highly efficient and often used in deep-space missions, while chemical thrusters provide quick bursts of power for launch and landing.