A ground fault circuit interrupter (GFCI) is a safety device designed to protect people from electric shock. It works by monitoring the flow of electricity in a circuit. If it detects an imbalance, such as when electricity is leaking to the ground, it quickly shuts off the power to prevent injury. GFCIs are commonly installed in areas where water is present, like kitchens and bathrooms. They can be found in outlets or as part of circuit breakers. By cutting off electricity in dangerous situations, GFCIs help reduce the risk of electrical accidents and enhance overall safety in homes and workplaces.