A ground fault circuit interrupter (GFCI) outlet is a safety device that protects people from electrical shock. It does this by detecting imbalances in the electrical current flowing through the outlet. If an imbalance is detected, the GFCI outlet will trip, cutting off the power to the outlet.
GFCI outlets are required in all new homes and businesses, and they are also recommended for use in older homes and businesses. They are especially important in areas where there is a risk of electrical shock, such as bathrooms, kitchens, and outdoor areas.