Ramjets are a type of jet engine that use the force of kinetic energy to compress air and provide thrust. Synonyms for ramjets include supersonic combustion ramjets (Scramjets), rocket engines and pulse detonation engines. Scramjets are similar to ramjets but use supersonic airflow through the engine to ignite fuel, providing even greater thrust. Rocket engines use fuel and oxidizer to create thrust through a chemical reaction, and are commonly used in space travel. Pulse detonation engines use detonation waves to compress and ignite fuel, resulting in increased efficiency and power. Each of these engine types has its unique properties, making them suitable for different applications.