Although turbojet and turbofan jet engines are similar, the things that set them apart make them very different. Here's what you need to know.

The first type jet engine was a turbojet that went into production in 1939, finding a home on the German Me 262, making it the first fighter jet to fly during WWII.

Pratt & whitney developed the 4,500-kilogram (10,000-pound) thrust JT3 turbojet engine in 1950. It powered such military aircraft as the Boeing B-52, Convair F-102, Douglas A3D, Lockheed U-2, ...