Links with rel="no-follow" attribute are known as no follow links. No follow links are unable to pass link juice but sometimes can drive quality traffic to website. Take facebook or twitter as example.
Nofollow links are those which are not followed by SEs.Nofollow link does not pass any link juice with other website.But nofollow links are helpful to generate traffic as well as making link building work more natural.
Before I even start this post I will like to tell you that a Link is a connection that you can create between two websites.
These links can be normally located inside Text or Pictures and you will need to use basic HTML Markup to create these connections.
So as you can see links are just simple connections that point to different websites, but now what is a NoFollow Link?
The difference between a Normal Link and a NoFollow Link is that the NoFollow Link has a special HTML Markup inside that tells the Search Engines like Google to NOT FOLLOW the destination inside the link.
A no follow link is a web page link which contains the no follow attribute within the anchor tag coding. Not all search bots honor this attribute. This means that Google does not transfer Page Rank or anchor text across these links. Essentially, using no follow causes us to drop the target links from our overall graph of the web. However, the target pages may still appear in our index if other sites link to them without using no follow, or if the URLs are submitted to Google in a Sitemap. Also, itâ€™s important to note that other search engines may handle no follow in slightly different ways.