How was the battle at Normandy a turning point in World War II?

The battle of Normandy was one of the greatest victories for the Allies. At the start of July 1944, hundreds of thousands of troops swept the Germans at Normandy and kept pushing. They liberated Paris in just about a couple of months at the end of August 1944. Germans would drastically lose control of Europe and surrendered about a year later in 1945.