The Supplemental Nutrition Assistance Program (SNAP), formerly called the Food Stamp Program, is designed primarily to increase the food purchasing power of eligible low-income households to help them buy a nutritionally adequate low-cost diet. This book describes the rules related to eligibility for SNAP benefits as well as the rules for benefits and their redemption. It also provides an overview of the problem of food insecurity in the United States and the important role that SNAP plays in addressing it.