Radar technology had been around before World War 2 if I'm correct. It probably wasn't heavily used as it is today or in ww2. WW2 saw a great improvement on radar; radar saved England during WW2 because they could detect German planes before they got even close to land.
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Radar, jet engines and atomic bombs.
How? Beacause it was telling the soldiers where the piolits were
World War 2 saw the first wartime use of radar.
the two advances were the aircraft and the tanks
Technology advances hugely in every war. In WW2 it made better radio, radar, atomic weapons, faster fighters, bigger bombers, and better vehicles.