an alphabetical list of words relating to a specific subject, text, or dialect.
A nofollow tag is a basic piece of HTML. Appended to a hyperlink, it allows webmasters to control whether search engines follow a link or not.
For example, the following URL on a page of our website allows search engines to visit Envigo’s website and credit the website with the link; each link is scored by the search engines, supporting SEO:
<a href="https://www.facebook.com/envigo" title="Envigo Facebook">Visit Our Facebook Page</a>
Here's the same hyperlink, now including a nofollow tag:
<a href="https://www.facebook.com/envigo" title="Envigo Facebook" rel="nofollow">Visit Our Facebook Page</a>
The inclusion of a nofollow tag instructs the search engines NOT to visit the site, or rather not to ascribe credit to boost the ranking of the destination site based on the link.