How does a polarized plug work? What is the benefit of using it?

A polarized plug is a plug with one large or wide prong and one narrow one. It ensures that the plug is inserted correctly in a socket for proper flow of electric current, and reduces the risk of electrical shock. Consumers should never force a polarized plug into a non-polarized outlet, or shave the wide prong down to fit. Use an adapter or find an appropriate polarized outlet.