What was the purpose behind the D-Day invasion?

The D-Day invasion, officially known as Operation Overlord, aimed to establish a significant Allied foothold in Western Europe to combat Nazi Germany during World War II. Launched on June 6, 1944, it involved a massive amphibious assault on the beaches of Normandy, France, and was crucial for opening a new front against German forces. This operation was intended to weaken German military strength and ultimately lead to the liberation of occupied territories and the defeat of Nazi Germany. Additionally, it sought to bolster Allied morale and cooperation among the various Allied nations.