A no-follow link is a link from one website to another that does not pass PageRank and authority. No-follow links don’t count as a “vote” for the linked-to page.
They can be helpful if you’re linking to an external site but you don’t want to pass along your PageRank. Or, if you’re linking to questionable content, you don’t want to be associated with it.
No-follow links don’t have as much weight as regular “do follow” links. But they still have some weight and can improve your website’s visibility and traffic.
To create a “no-follow” link, add an HTML attribute rel=” nofollow” to your link. Most CMS, like WordPress, offer a switch to add without touching HTML.