What is a Nofollow Link?

Nofollow is Backlinks that do not score any points to the linked website. They don’t pass the authority because of the rel=”nofollow” HTML tag that tells crawlers not to count it. Links marked up with rel=”nofollow” do not pass PageRank. Google encourages the use of these in some situations, like when a link has been paid for.

From Simba’s SEO Dictionary