tell search engines "Don't follow links on this page"

on

By Turki Aljrees at 31/03/2014

Use rel="nofollow" for specific links

"Nofollow" provides a way for webmasters to tell search engines "Don't follow links on this page" or "Don't follow this specific link."

Before nofollow was used on individual links, preventing robots from following individual links on a page required a great deal of effort (for example, redirecting the link to a URL blocked in robots.txt). That's why the nofollow attribute value of the rel attribute was created. This gives webmasters more granular control: instead of telling search engines and bots not to follow any links on the page, it lets you easily instruct robots not to crawl a specific link. For example:
 <a href="signin.php" rel="nofollow">sign in</a>

Source : Google Help Forum