Definition of Nofollow and Dofollow tags

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 another site allows search engines to visit Smart insights' website and credit the website with the link; each link is scored by the search engines, supporting SEO: <a href=http://www.smartinsights.com/ title=Smart Insights<Visit Smart Insights</a> This normal, natural type of link is sometimes known as 'do-followed'! Here's the same hyperlink, now including a nofollow tag (highlighted in red): <a href=http://www.smartinsights.com/ title=Smart Insightsrel=nofollow Visit Smart Insights</a>.

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