SAP APO stands for Advanced Planner and Optimizer. SAP APO is a supply chain planning tool; that helps organizations manage their supply chain. SAP APO has primarily four modules DP (Demand Planning), SNP (Supply Network Planning),PPDS (Production Planning and Detail Scheduling), GATP (Global Available to Promise). SAP Advanced Planning and Optimization ( SAP APO ) offers a fully integrated pallet of functions that you use to plan and execute your supply chain processes. SAP APO supports the following: • Business collaboration on a strategic, tactical, and operational planning level • Co-operation between partners at all stages of the supply chain process; from order receipt, stock monitoring, through final shipping of the product • Cultivation of customer and business partner relationships • Constant optimization and evaluation of the supply chain network’s efficiency.