S/4HANA is SAP's "big rewrite." By moving classic ECC to the HANA in-memory database, it delivered dramatic performance, real-time analytics and a modern interface.
01. The HANA Database
HANA works columnar and in-memory. 10-100x faster than classic SQL Server or Oracle.
02. The Fiori Interface
Modern web-based Fiori instead of the classic SAP GUI. Mobile-first, role-based.
03. From ABAP to RAP
ABAP still exists, but RAP (RESTful ABAP Programming Model) is the new standard.
04. Migration Paths
Brownfield (conversion from existing ECC) or Greenfield (a new system from scratch).
05. The 2027 Deadline
SAP extended ECC support until the end of 2027. Migration is essential.