In warehouse what does SAP mean?

For Warehouse depending on your requirement of control and stock visibility you can go either of the below two options:1. SAP R/3 Inventory Management which is part of SAP Material Management (MM) to control day today inventory with limited visibility and control.2. SAP WMS (Warehouse Management System) is an add on over and above SAP R/3 MM which give you better visibility and control at rack and bin level.