SQL Server - Sqlserver Audit

Hi all,

 I have to know one thing

        i.e What is  the meaning of Sql server Audit and what is the use  in Real time is there any good  links for knowing from Basic ,in what type of application it is used like bank apps or e commerce sites...

It is used to audit access and modifications to tables.  Yes, banks would be likely.  Law enforcement would also be another category of application types that might want to keep track of this sort of thing.

Do not use it willy nilly though.  It has a pretty negative impact on performance.