What is data base interface and the role it will play while retrieving data

What is data base interface and the role it will play while retrieving data.

Hi,
   check out the following link.
http://help.sap.com/saphelp_nw04s/helpdata/en/97/68d64260752a78e10000000a155106/frameset.htm
it says:
Database Interface
Interface to the database of the NetWeaver AS ABAP that is integrated in the ABAP-runtime environment. The statements of Open SQL and Native SQL access the database using the database interface. The database interface is responsible for data transport between business layer and persistence layer, automatic client handling, and SAP buffering.
hope it helps.
Regards,
kinshuk

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