A liquid rocket is a type of rocket engine that uses liquid propellants to produce thrust. These propellants typically consist of a fuel, such as liquid hydrogen or kerosene, and an oxidizer, like liquid oxygen. When the fuel and oxidizer are combined and ignited in a combustion chamber, they create high-pressure gases that are expelled through a nozzle, generating thrust to propel the rocket. Liquid rockets are known for their efficiency and controllability compared to solid rockets. They can be throttled, shut down, and restarted, making them suitable for various missions, including launching satellites and crewed spaceflights. Notable examples of liquid rockets include the Saturn V and the SpaceX Falcon 9.