The Agricultural Marketing Service administers programs that attempt to facilitate the fair marketing of U.S. agricultural products. The Animal and Plant Health Inspection Service attempts to safeguard America's resources from exotic invasive pests and diseases and monitor and manage agricultural pests and diseases existing in the United States.
The USDA's Agricultural Marketing Service works to promote fair trade practices for American farm products, whereas the Animal and Plant Health Inspection Service focuses on safeguarding U.S. agriculture against external threats and managing domestic pest and disease issues.