Can you please explain the difference between SAP HANA and s4HANA?

Dear Swatee,
Both are same ,

 The SAP HANA Database is a full-fledged, in-memory, relational database which is optimized for transactional (OLTP) and analytical (OLAP) processing. It is even more than just a database: SAP HANA is a platform which combines database, data processing, and application platform capabilities in-memory