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No Follow attribute

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="" title="Envigo Facebook">Visit Our Facebook Page</a>

Here's the same hyperlink, now including a nofollow tag:

<a href="" 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.