NoFollow External Links in WordPress
As mentioned above, links help search engines decide which pages are important. When you link to a website, you are passing some of your site’s SEO score to that link. This SEO score is called “link juice.”
For good search rankings you need to make sure that you are getting more link juice from other websites than you are giving away.
Adding the “nofollow” attribute to external links (links to websites that you don’t own) instructs search engines not to follow those links. This helps you save link juice.
A normal external link looks like this in HTML:
<a href="http://example.com">Example Website</a>
An external link with the nofollow attribute looks like this:
<a href="http://example.com" rel="nofollow">Example Website</a>