Hi Neeraj,
SAP HANA as primary database is for Business suite applications. All business suite applications like ECC, CRM, SCM etc run on top of HANA database. These applications with HANA runs in same way as RDBMS but with faster processings. But still HANA is not full fledge utilisation since our existing applications are heavy due to many indexing tables etc. Now the SAP has come up with simple, lighter and faster business applications like Simple finance, simple logistics etc which is nothing but S4 HANA.
Best Regards,
Mohammed