Data conversion is an essential part of your SAP S/4HANA project. If you opt for a Greenfield implementation, data conversion means the extraction, transformation, and loading of your legacy data into SAP S/4HANA. If you opt for a Brownfield migration, then the data conversion process is much simpler, as you need to migrate data from the source SAP ERP system to SAP S/4HANA. SAP provides tools to automate the entire data conversion process in this case. Thus, the data conversion process is executed much faster. More details on the data migration process and associated tools can be found in Chapter 7.