What date is known as D-Day in the context of World War II?

D-Day refers specifically to June 6, 1944, when Allied forces launched the largest amphibious invasion in history during World War II. This operation, known as Operation Overlord, marked a significant turning point in the war as Allied troops landed on the beaches of Normandy, France, to liberate Western Europe from Nazi occupation. The success of this mission was crucial in establishing a foothold for Allied forces in Europe, leading to the eventual defeat of Nazi Germany.

The other dates mentioned have significant historical relevance but are associated with different events. December 7, 1941, is known for the attack on Pearl Harbor, which prompted the United States to enter the war. May 8, 1945, is celebrated as Victory in Europe (VE) Day, marking the unconditional surrender of Nazi Germany. April 1, 1944, does not have a widely recognized significance in the timeline of World War II. Thus, the date June 6, 1944, uniquely identifies the launch of a pivotal operation in the war's history, earning it the title of D-Day.