You might have experienced the job of spammers, commenting with links to their sites if you have a blog or any user interactive website. Google spider (GoogleBot) crawls from one link to other.

Suppose you do a post and have users commenting to your post, you will find that you get lots of comments which are really not relevant, but just to create links to some spam websites. Google gives some credit to such links and improves the position in search result ranking. This really spoils Google’s Search results with spammy sites. To avoid this Google introduces this tag rel=nofollow in Jan-2005.
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