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Mon 14 Sep, 2009 06:18 am
According to me it is use to remove the duplication between same content of page. So that google should allow to crawl the pages.
Please give your comments ..
It allows you to specify which of your urls is the canonical url. Yes, it helps search engines figure out duplicate content issues.
You can read more about it here:
http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html