What is a nofollow link?
Nofollow links are links with a rel=”nofollow” HTML tag applied to them.
For example, this is a nofollow link:
<a href=”http://www.hello.com/” rel=”nofollow”>Link Text</a>
The nofollow tag tells search engines not to follow that link. Because nofollow links do not pass PageRank, they likely don’t impact search engine rankings.
In the above example, rel="nofollow" is the nofollow tag which is telling search engines to ignore this specific backlink, or that the backlink should not pass SEO power (ie. link juice) to the site it links to.
Should nofollow links be disavowed?
Having a nofollow tag does not necessarily mean a link is spammy and should be disavowed. Nofollow links can still be valuable if they lead to referral traffic from people clicking on the link.
Whether a link should be disavowed depends on many factors, and should not be decided based on any single factor or metric. This guide should help.