The NK-25 is a type of rocket engine developed by the Soviet Union for use in the N1 launch vehicle. It is a liquid-fueled engine that utilizes a combination of kerosene and liquid oxygen as propellants. The NK-25 was designed to provide high thrust and efficiency for launching heavy payloads into space. This engine is notable for its use in the ambitious Soviet lunar program, which aimed to land humans on the Moon. Although the N1 rocket, equipped with NK-25 engines, never successfully completed a mission, the technology contributed to advancements in rocket propulsion and engineering.