SAP APO (Advanced Planner and Optimizer) is a supply chain management tool used for planning and executing supply chain processes. It forms the technical foundation for many SAP modules. SAP APO training can benefit both freshers and professionals by teaching them how to use SAP APO for demand planning, supply network planning, and other supply chain functions. The course covers topics like APO configuration, demand forecasting, supply planning, deployment planning, and transportation load building.