Blitzkreig means "lightning war". It was first used by the germans in World War Two and was a tactic based on speed and surprise and needed a military based around light tank units supported by planes and foot soldiers. Hans Guderian was the german who developed this tactic.
Blitzkreig was based on speed, co-ordination, and movement. It was made to hit hard and move quickly. Its goal was to create panic among the civilians.
In 1941 a diary of a French soldier was found, it helps us understand how effective Blitzkreig was.

"When the dive-bombers come down, they (the French) stood it for two hours and then ran with their hands over their ears."
"Sedan fell as a result of a bombardment……….it was a superb example of military surprise."
"The pace is too fast……it’s the co-operation between the dive-bombers and the tanks that is winning the war for Germany."
"News that the Germans are in Amiens………this is like some ridiculous nightmare."
All of the comments above were written in a matter of five days.