Regarding ODBC/JDBC driver

Hi

To connect SAP BO Tools with HANA, document says ODBC/JDBC thru SQL is required.

What does it mean.. Does connectivity need both or we can use any one of them?

Anybody know when to use which one?.

To my understanding, i feel either one of them can be used...but when it has to be used?

No document explains on this.. pls share if any document.

Regards

Magalingam