The Household Food Security Survey Module (HFSSM), developed by the USDA’s Food and Nutrition Service and the CDC’s National Center for Health Statistics, is a standardized tool assessing household-level food security through 18 questions. It categorizes households into four tiers: food secure, marginal, low, or very low food security. Focused on group dynamics, it informs policy, research, and programs addressing food insecurity. Key features include scalability for large surveys, integration with tools like ADePT-FSM, and adaptability in derivatives like ELCSA. Limitations include challenges in equating food security status across households with and without children. It remains a cornerstone for monitoring food insecurity globally and nationally.