GFCIs prevent serious shock
A ground fault circuit interrupter is a fast-acting circuit breaker that senses imbalances in a circuit caused by any leaking electric current and shuts off the electricity instantly. You can recognize GFCI outlets by the test and reset buttons on them.
Grounding plugs protect you
The round plug on a three-pronged plug connects inside the outlet to a ground wire. If the outer surface of an appliance or tool becomes energized, electricity will travel to the ground through the ground wire rather than through you. Never modify or remove the third prong.
GFCIs and grounding plugs keep electricity traveling on a safe path to the ground and protect you from shock.