What was the main mission of the paratroopers in the Normandy invasion?

The paratroopers main mission was to cut off German reinforcements. The two main areas where paratroopers were needed was Caen and Carentan. Carentan was taken by U.S. 101st and 82nd airborne divisions. The critical area in carentan was St. Mere Eglise. Caen was taken by the British 6th Airborne Division. The critical area here was Pegasus Bridge, which was necessary to keep intact for the allied offensive.