Enterprise Resource Software is a total software solution packages for running large businesses.
Large businesses do a lot of different things, and therefore have a lot of different software needs.
Many large companies want to be able to buy one package that does everything from keep track of sales orders, to payroll, to manage inventory, to spit out their end of fiscal year tax return and SAP is trying to fill that need. However, it is impossible for SAP s programmers to design software that covers the needs of every single large business. Every business is different. They manufacture different products. Their employees have different titles.