Link spam
 

Link spam is defined as links between pages that are present for reasons other than merit. Link spam takes advantage of link-based ranking algorithms, which gives websites higher rankings the more other highly ranked websites link to it. These techniques also aim at influencing other link-based ranking techniques such as the HITS algorithm.

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Link Spaming is the practice of using improper Search Engine Optimization (SEO) tactics in an attempt to manipulate or elevate the placement of a web site on a search engine's search results pages