What did bombardiers do in World War 2?

Bombadiers were part of the crew of bombers with the special job during the bombing run of sighting up the target in order to drop the bombs on or as near the target as possible. When the bomber approached the target, the pilot handed over the control of the plane to the bombadier who then, while looking into the sighting mechanism called the Norden Bombsight. The bombadier had control of the toggle switch which actually released the bombs. After dropping the bombs, the bombadier became one of the gunners on the bomber as the plane made its way back to the base.