The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the turbo portion refers to a gas turbine engine which achieves mechanical energy from combustion.and the fan, a ducted fan that uses the mechanical energy from the gas turbine to force air rearwards.https://en.wikipedia.org/wiki/Turbofan