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 flows through a person to the ground, it quickly cuts off the power, reducing the risk of injury. GFCIs are commonly used in areas where water is present, such as bathrooms, kitchens, and outdoor spaces. They can be installed in outlets or as part of a circuit breaker. Using a GFCI is an important safety measure to prevent electrical accidents and ensure safe use of electrical devices.