Cryogenic propulsion is a technology that uses supercooled liquids as propellants in rocket engines. These cryogenic fuels, such as liquid oxygen and liquid hydrogen, are stored at extremely low temperatures, allowing them to remain in a liquid state. When ignited, they produce a high-energy reaction that generates thrust, making them efficient for space travel. This method is commonly used in modern space missions, including those by NASA and SpaceX. Cryogenic propulsion systems offer higher performance compared to traditional fuels, enabling rockets to carry heavier payloads and travel longer distances in space.