The strategic purpose of the D-Day invasion, conducted on June 6, 1944, was to establish a foothold in continental Europe and initiate the liberation of Western Europe from Nazi occupation during World War II. This large-scale military operation, also known as Operation Overlord, involved Allied forces landing on the beaches of Normandy, France. The success of D-Day allowed the Allies to take crucial territory, divert German resources, and ultimately led to the pushing back of German forces. This pivotal moment marked a turning point in the war, contributing significantly to the eventual defeat of Nazi Germany in May 1945.