Liquid propulsion is a method used to propel rockets and spacecraft by burning liquid fuels. This process involves mixing a fuel, such as liquid hydrogen, with an oxidizer, like liquid oxygen, in a combustion chamber. When ignited, the resulting hot gases expand and are expelled through a nozzle, generating thrust. This technology is crucial for space exploration, as it allows for precise control over the thrust and direction of the vehicle. Liquid propulsion systems can be restarted multiple times, making them suitable for missions that require complex maneuvers, such as those involving satellites or interplanetary travel.