Why is the normandy invasion considered one of the turning points of world war 2

On June 6, 1944 the Allied Forces of Britain, America, Canada, and France attacked German forces on the coast of Normandy, France. With a huge force of over 150,000 soldiers, the Allies attacked and gained a victory that became the turning point for World War II in Europe. This famous battle is sometimes called D-Day or the Invasion of Normandy. By the end of D-Day over 150,000 troops had landed in Normandy. They pushed their way inland allowing more troops to land over the next several days. By June 17th over half a million Allied troops had arrived and they began to push the Germans out of France.