guys i know to u it may even sound funny for someone to ask what is do follows & whats is no follows....but i seriously have no idea... so please help me out.... let me know their definition and differences... thanks in advance...
Google have introduced nofollow tag to fight against few things like: Paid Links, Spam etc. If a link have no follow tag, the Google passes no PR juice to the linked site, and no credit of any kind is passes. So it means that, no follow links are not backlinks at all. They worth nothing.
You could use them to link to other websites, but not let any of your PR flow out from your own page(s). Useful if you have a directory page or affiliates page where you'd want to list numerous other sites while not letting your PR leak out to all of them.
Do Follow are very important terms to understand when you are trying to build great links back to your site in order to increase your search engine rankings.