Hi Rakesh,
As already said BODS is one of the methods through which we can load data into HANA.
It can be used to perform data integration(ETL), Data Quality Management, Data Profiling, Metadata Management and Text Analytics.
You can also use BODS with unstructured data or data from any other database and send it to HANA.
To know more about Data Services, check:
You can learn more from BODS space:
http://scn.sap.com/community/data-services
You can check the following videos regarding HANA and BODS:
http://www.saphana.com/community/implement/hana-academy#working-with-data-sap-data-services
Regards,
Vivek