What is ref="nofollow"

Stop Search engine to follow link’s from your website .ref=”nofollow” means Does not follow link on site . This is important task for every website owner to write ref=”nofollow” in html code. By this search engine does not follow link on site.In blogger their also give extra option when we create link

 If in your site html code their is no ref=”follow” then you must add this in meta tag

For more read this help