A GFCI reset button is a critical safety feature on Ground Fault Circuit Interrupters (GFCIs) that provides protection against electrical shock and fires. When a ground fault is detected, the GFCI interrupts the electrical flow by tripping itself. To restore power, the reset button must be pressed. Proper placement of the reset button near potential hazard areas is crucial for easy accessibility during emergencies. Proper installation, testing, and maintenance of GFCIs ensure optimal electrical safety in homes and workplaces.