What is Normandy Landings or D-Day?

Its the historic World War-II event

Landing of paratroopers at Normandy beach, France

Soldiers from paratroops landed on 6-June-1944

6th June is known as D-Day or Normandy Landing day

This operation was the beginning of France liberation

Its airborne attach 

Americans were assigned to land at Utah beach and Omaha beach

British were assigned to land at Gold beach and Sword beach

Allied forces attacked Germany

Allied forces defeated Germany

In memory of this, Normandy Landings or D-day is celebrated

In memory of this, Normandy Landings or D-day is celebrated