No-follow link

Yes some nofollow links are also required for better ranking of your site.

I think Hina, You are going to take a wrong thing. You know that Matt Cutts states quite clearly that "Google does not take NoFollow links into consideration when ranking a site." Check here.. https://support.google.com/webmasters/answer/96569?hl=en . You just think about rel="nofollow" attribute, What is it going to say? It is just going to say that "Hey search engines, don't follow this link, just ignore it."
 
no follow doesn't count as back link to the site from search engine but it can be helpful as an traffic generate source if it's come from high pr sites.The idea behind a no follow link is that a search engine will not click through a link flagged as such. A no follow link can be good or bad depending on the context of how it is utilized.
 
No follow links may not pass on benefits from the point of view of seo but passes a good amount of benefits by fetching traffic for website if coming from high traffic website.
 
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