What is Nofollow?
A nofollow tag is a meta tag in the HTML code of a web page that tells search engines to disregard the page. On pages such as blog posts that invite user comments, a nofollow link protects you from search engines ranking your page based on user comments you can‚Äôt control. Let’s say some users comment on your blog post to promote their products and stuff your comments with keywords. You can use a nofollow tag to avoid search penalties.
Example
Imagine a social media post recommending a book and providing a link to purchase it. However, the person making the recommendation is compensated for each click on the link. To avoid passing on ranking credit to the linked site and maintain transparency about the compensation, they specify the link as “nofollow.” Thus, search engines understand not to consider this link when assessing the linked site’s search engine ranking.