In short, do-follow link gives linked site traffic and some juice which affects it's rankings somehow. no-follow link gives traffic only, no SEO benefits passed through.
here you do, all you need to know about nofollow: http://en.wikipedia.org/wiki/Nofollow dofollow is something just the opposite or a link that isn;t nofollow
You could of Just Googled this and millions of answers would of come up. Btw, I read somewhere that Google might just ignore no follow tag in the distant future.
hi, when you post your link on others website then if they have a tag in html some thing like rel="no follow" then its mean your link is just a text for search engine they will treat it not like a regular link . so if there is no rel tag then its a do follow link and search engine will follow and rank it as link ++ . cheers
This is very easy to explain the difference between do follow and no follow! Actually the absent of rel="no follow " tag in HTML Code is called do follow! Do follow link crawl by bot but in no follow search engine bot never crawl it! So to get more back link this is an important that the inbound link should be from do follow type of site.