Search engines take into account what sort of links lead to a specific website and where those links come from. A link from a reputable and trusted website is worth a lot. To prevent abuse by link spamming, (like the comment section of a reputable website being spammed with links to smaller websites to get those valuable links) the “rel=“nofollow” attribute can be used. The “nofollow“-tag signifies to search engines, that this particular hyperlink should not be regarded when analyzing the target website.
Be careful not to misuse the “nofollow” attribute by indiscriminately adding it to internal links. You usually want internal links to be followed as not to interfere with linkjuice.
The “nofollow” attribute is used in HTML like this:
<a href=“http://domain.com” rel=“nofollow”>Text</a>
If all links on a particular page should have “nofollow” it may also be added to the header:
<meta name=“robots” content=“nofollow” />