Final answer:
D-Day refers to the Allied invasion of Normandy, France on June 6, 1944, which became the largest amphibious assault in history led by General Eisenhower and resulted in the liberation of Paris.
Step-by-step explanation:
The invasion of the German occupied regions of northern France on June 6, 1944, is known as D-Day. This massive military operation involved a significant number of Allied troops, including forces from the United States, Britain, and a contingent of Canadians, undertaking an amphibious landing along a fifty-mile stretch of coastline in Normandy. The operation was a surprise assault across the English Channel, facilitated by poor weather which helped to catch the German defenders off guard.
Despite the formidable German defenses, the Allies were able to secure a beachhead, overwhelming the German positions and laying the groundwork for further advancement into Europe. Major points included the landing of the 82nd and 101st Airborne Divisions behind enemy lines, the coordination under General Dwight D. Eisenhower, and the liberation of Paris following the successful beach landings at locations coded as Sword, Juno, Gold, Omaha, and Utah beaches.