HANA was in the first instance a in memory database - at least partly invented by SAP. Because SAP marketing pushed "in memory" so much, all of the SAP employees believed that HANA was the solution to all problems with SAP software. Therefore SAP named all of its products SAP HANA .... Like SAP HANA Cloud Platform, SAP HANA Cloud Integration, etc. Those products were not even related to the in memory database. It's all marketing bullshit and SAP has even taken a few steps back as too many customers were disappointed.

Ultimately I think the HANA database is an overhyped in-memory database. The reason they make money with HANA is that they are successfully replacing Oracle Databases for their SAP on-premise customers.