Pulse-jet propulsion can be defined as a type of jet engine where combustion occurs intermittently at a high frequency, creating a pulsating thrust. Synonyms for this propulsion system include pulse detonation engine, pulsed combustion engine, and pulsejet engine. Some people may refer to it as a valveless engine since the absence of valves makes the operation of the pulsejet engine more straightforward. Another synonym for pulse-jet propulsion is a ramjet engine, which is a type of air-breathing engine that operates by using the vehicle's forward motion to compress incoming air. Regardless of the name, pulse-jet propulsion is an innovative means of propulsion with various applications in the aerospace industry.