The nofollow tag allows publishers to inform Google and other search engines that they do not endorse certain links to other pages.
Nofollow is crucial for search engine optimisation as it proves to search engines that they are not selling influence or are involved in schemes deemed as unacceptable SEO practices.
By using a nofollow tag, you are basically informing search engines to ignore this link. That means that nofollow links do not affect your sites page rankings.
Nofollow tags were introduced to HTML in 2005 by Google, Microsoft, Yahoo and major blogs mainly to prevent comment spam in blogs.
Matt Cutts said at the time: “The nofollow tag allows a site to add a link that abstains from being an editorial vote. Using nofollow is a safe way to buy links, because it’s a machine-readable way to specify that a link doesn’t have to be counted as a vote by a search engine.”
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