Ram jet propulsions are a type of jet engine that operates on the principle of the ram effect. They utilize the kinetic energy of the incoming air to compress and ignite the fuel, producing thrust without the need for any moving mechanical parts. Synonyms for ram jet propulsions include ramjet engines, supersonic combustion ramjets (scramjets), and air-breathing engines. These engines are primarily used in military applications, such as missiles and unmanned aerial vehicles. They are capable of producing extremely high speeds and can operate at altitudes where other types of engines would fail. Ram jet propulsions are a vital technology for modern aviation and have proven to be an important asset for defense forces worldwide.