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nofollow

nofollow is an HTML attribute value used to instruct some search engines that a hyperlink should not influence the link target's ranking in the search engine's index. More at Wikipedia
Google PageRank
Search engine optimization - Search engine optimization is the process of improving the volume or quality of traffic to a web site from search engines via "natural" or un-paid search results as opposed to search engine mark...
Search engine spiders, also called web crawlers
Noindex - The noindex HTML meta tag advises automated Internet bots to avoid indexing a Web page.
Meta elements - Meta elements are HTML or XHTML elements used to provide structured metadata about a Web page.
 

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