SAP's products focus on Enterprise Resource Planning (ERP). The company's main product is SAP ERP. The current version is SAP ERP 6.0 and is part of the SAP Business Suite. Its previous name was called R/3. The "R" of SAP R/3 stood for realtime - even though it is not a realtime solution. The number 3 related to the 3-tier architecture: database, application server and client (SAPgui). R/2, which ran on a Mainframe architecture, was the predecessor of R/3. Before R/2 came System RF, later dubbed R/1. SAP ERP is one of five enterprise applications in SAP's Business Suite. The other four applications are: * customer relationship management (CRM) - helps companies acquire and retain customers, gain marketing and customer insight * product lifecycle management (PLM) - helps manufacturers with product-related information * supply chain management (SCM) - helps companies with the process of resourcing its manufacturing and service processes * supplier relationsh