I have searched about automation testing and got idea what it is! but have not found any proper definition regarding AUTOMATION TESTING. Please help me
closed as not a real question by dzieciou, Dan Snell, squeemish, Suchit Parikh, corsiKa♦ Jun 5 '13 at 15:43
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I assume you meant "Automated Testing" rather than "Automation Testing". Here's the definition I use in my daily activities:
Testing which is performed, to a greater or lesser extent, by a computer, rather than manually.
It's part of a Glossary of Terms I have developed over the years that comes in handy when answering this sort of question. http://www.allthingsquality.com/p/testing-terms-glossary.html
I use a Glossary internally within my QA Team, and externally as well. It often helps when everyone on your team uses the same words for the same terms.