SAP S/4HANA is not a single product, but is a suite covering many applications. Customers can start with the basic components and add to them later. SAP S/4HANA Enterprise Management is a great place to start. This is known as the "simplified core". It is helpful to think of SAP S/4HANA Enterprise Management as the replacement for SAP ERP. It offers support for all core business processes such as quotation to cash, procure to pay, and so on.For many customers, this is where their SAP S/4HANA adoption begins.Then, SAP S/4HANA Lines of Business (LoB) solutions can be added and they integrateseamlessly with the core. These are options that can be added at any time, and provide best-in-class lines of business solutions and ready-to-go connections to SAP business networks.Customers choose the LoB solutions that suit their businesses, to significantly extend the functionality of the core.In the past, we also had multiple add-on applications surrounding the core (for example, SAP CRM and SAP SRM surrounded the core ECC), but we had overlapping models and much redundancy. Overlaps and redundancy have been completely removed from SAP S/4HANA.An example of an overlap with SAP ERP and SAP CRM would be a customer master recordcreated with SAP ECC and then the same customer would have a Business Partner record inSAP CRM. The same was true for materials created with ECC, which would also be re-created in APO.