What is a no follow link?

Nofollow is html tag that website owners, add to links in their website for the search engines not to crawl, notice, or acknowledge a link. While a nofollow link is ignored, but popular social networking site like Twitter, Facebook, LinkedIn, Myspace sites are nofollow, but they do provide a lot of other benefits.
 
Nofollow links are the links which are not indexed by web crawlers and it is used only to generate website traffic.
 
No follow is a link attribute that instructs spiders not to crawl the particular backlink on the webpage. Hence these links are never indexed in search engines. They are only used to build traffic from various external webpages.
 
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