Turbojet propulsion refers to the use of an engine that compresses air and burns fuel to create thrust for powering an aircraft. Synonyms for this technology include jet propulsion, gas turbine propulsion, and turbofan propulsion. Jet propulsion describes the general process of moving an aircraft through the use of a jet engine, while gas turbine propulsion specifically refers to the use of a gas turbine engine for generating power. Turbofan propulsion is a type of gas turbine propulsion that incorporates a fan for increased efficiency. These synonyms all describe the same general principle, which revolutionized aviation in the mid-20th century and continues to drive innovation in the aerospace industry today.