Why did the operation overlord happen?

Operation Overlord, the Allied invasion of Nazi-occupied Europe, was launched to liberate Western Europe from German control during World War II. It aimed to establish a foothold in France, which would allow for the expansion of military operations against the Axis powers. The operation also sought to open a new front in the war, relieving pressure on Soviet forces in the east and ultimately leading to the defeat of Nazi Germany. The successful landing at Normandy on June 6, 1944, marked a pivotal turning point in the war.