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In addition to rankings by content, many search engines rank pages based on inbound links.
Google's description of their PageRank system, for instance, notes that Google interprets a link from page A to page B as a vote, by page A, for page B.[1] Knowledge of this form of search engine rankings has fueled a portion of the SEO industry commonly termed linkspam, where a company attempts to place as many inbound links as possible to their site regardless of the context of the originating site.
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