A No-Follow Link is a function by which a website tells search engines it does not want to pass credit to another webpage. A No-Follow Link tells a search engine authority (like Google or Bing) not to follow or send traffic to a linked website, usually to protect the origin site from a negative association with spammy or questionable content. Search engines all respect No-Follow Links to varying degrees, and a No-Follow Link is not a guarantee.  See Also: SEO and Outbound Link