Rocket propulsion is a method of moving spacecraft and missiles by expelling mass at high speed. This is achieved through the combustion of fuel in a rocket engine, which produces thrust according to Newton's third law of motion. The expelled gases push the rocket in the opposite direction, allowing it to ascend into space. There are various types of rocket engines, including liquid and solid propellant systems. Each type has its own advantages and applications, such as launching satellites or crewed missions. Understanding rocket propulsion is essential for advancements in space exploration and technology.