A Ground Fault Interrupter (GFI) 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 cuts off the power, reducing the risk of injury. GFIs are commonly used in areas where water is present, like bathrooms and kitchens, because water increases the risk of electric shock. They can be found in outlets or as part of circuit breakers. Installing a GFI is an important safety measure in any home or building.