rel="nofollow" attribute to increase page rank - pagerank tip

To get a better number of  search engine traffic to your site you need to make a good ranked page. There are several ways to improve your search engine ranking , you can search it on google.
Using rel="nofollow" really help you to prevent losing good ranks, This attribute can be used in links that goes out of your site . In such cases when you are in need of linking to any external sites you can use the link like <a href="http://external-site.com" rel="nofollow"> External link</a> , so that search bots will not follow the external sites . If you are not using these attribute the bots will go following the other external sites , it will cause the external site to get higher importance than yours, because you are referring to it .

So while you are adding external links in your sites , especially  when you are trying to promote a referral link to any sites then you should make sure that you have added rel="nofollow" attribute to the link.  It will surely help you in seo .