What was the strategic importance of the "second front" that the Allies opened in western Europe?

Adding a second front would help to split up the German troops. This would greatly reduce the pressure put on some of the troops on the Allies side, specifically the Soviet Union.

Explanation:

Opening a second front was necessary to deal with Germany. The Soviets were struggling against Germany. In order to lessen the blow the Nazis were taking on the Soviet Union, Stalin(the leader of the Soviet Union) needed the allies to divert German forces. This meant opening a second front. This also allowed for a full scale invasion of western Europe and eventually led to D-day.

i would think it's industries and hydroelectric power