The first jets used in worldwar 2

Jet aircraft made their first appearance in combat in World War II. By 1944 the German Luftwaffe committed three new types of jet or rocket fighter to combat operations. Besides the Me 262, the rocket fighter Me 163 "Komet" and the He 162 "Volksjäger" had become operational. The invention of the jets was a great advantage in war because the jets were much faster then ever before.

the invention of the jet engine

In 1913 René Lorin came up with a form of jet engine, the subsonic pulsejet, which would have been somewhat more efficient, but he had no way to achieve high enough speeds for it to operate, and the concept remained theoretical for quite some time.

The Heinkel He 178 was the world's first aircraft to fly under turbojet power, and the first practical jet plane, the pioneering example of this type of aircraft. It was a private venture by the German Heinkel company in accordance with director Ernst Heinkel's emphasis on developing technology for high-speed flight and first flew on 27 August 1939 piloted by Erich Warsitz.