(Enterprise Resource Planning) Software for running a business. ERP was coined as an extension of the concept of manufacturing resource planning (MRP) software, which automated the process of keeping a manufacturing line supplied with materials to meet incoming orders. ERP is a suite of applications including financials, manufacturing, human resources and other modules, that together automate the back-office business administration functions of an enterprise. Leading ERP vendors include SAP, Oracle, Peoplesoft and JD Edwards.