Ground Fault Circuit Interrupter (GFCI) outlets are life-saving electrical safety devices designed to prevent electrocution by quickly shutting off power when they detect an imbalance between the hot and neutral conductors, which indicates current is flowing through an unintended path, potentially through a person. GFCI protection is required by the National Electrical Code in areas where water and electricity may come in contact, including kitchens, bathrooms, garages, outdoor receptacles, laundry rooms, and crawlspaces. Despite their critical safety role, GFCI outlets are among the most commonly deficient items found during home inspections. Problems range from outlets that fail to trip when tested to complete absence of GFCI protection in required locations. In older homes built before GFCI requirements were added to the electrical code, the absence of these protective devices is expected but still represents a safety upgrade opportunity. In newer homes, non-functional or missing GFCI protection may indicate improper installation or component failure. Understanding how GFCI outlets work, where they are required, and how to test them empowers homeowners to maintain this essential safety feature.