A GFCI, or Ground Fault Circuit Interrupter, is a safety device designed to protect people from electric shock. It works by monitoring the flow of electricity in a circuit and quickly shutting off the power if it detects an imbalance, which can occur when electricity escapes to the ground. GFCIs are commonly used in areas where water is present, such as bathrooms, kitchens, and outdoor spaces. Installing GFCIs is an important safety measure in homes and buildings. They are typically found in outlet form, but can also be integrated into circuit breakers. Regular testing of GFCIs is recommended to ensure they are functioning properly and providing the necessary protection against electrical hazards.