What is API? Why we use in oracle Apps? Please explain me little bit.

Hi,
Can you please explain me step by step for what is API. why we use and where we have to use? please explain me.
Regards,
Raj

And in 11gR2 you can combine the two with the new feature Recursive Subquery Refactoring (well sort of, because you don't need the connect by bit)
I'd link to the official docs but they seem to be suffering intermittent issues at the moment so:
http://technology.amis.nl/blog/6267/oracle-rdbms-11gr2-new-style-hierarchical-querying-using-recursive-subquery-factoring
http://technology.amis.nl/blog/6104/oracle-rdbms-11gr2-goodbye-connect-by-or-the-end-of-hierarchical-querying-as-we-know-it

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