A Link Farm[3] represents a cluster of websites that all interlink with one another with the primary goal of improving their Otimização para motores de busca[1] (SEO) ranking. Originating in 1999 by SEOs, these farms were created to exploit the use of motor de busca[2] algorithms, specifically the Inktomi search engine that used link popularity as a ranking method. Link farms not only helped stabilize listings for online businesses with few natural links, but they were also manipulated by unscrupulous webmasters to increase Google[5]'s PageRank[6]. However, link farms are often viewed by search engines as a form of spamdexing[4], and can be filtered out during the ranking process. Despite this, they continue to be used in various forms, such as Private Blogue[7] Networks (PBNs), which are groups of blogs owned by the same entity aiming to promote external sites and boost search engine rankings.
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On the World Wide Web, a link farm is any group of sítios Web that all hyperlink to other sites in the group for the purpose of increasing SEO rankings. In graph theoretic terms, a link farm is a clique. Although some link farms can be created by hand, most are created through automated programs and services. A link farm is a form of spamming the index of a web search engine (sometimes called spamdexing). Other link exchange systems are designed to allow individual websites to selectively exchange links with other relevant websites, and are not considered a form of spamdexing.
Search engines require ways to confirm page relevancy. A known method is to examine for one-way links coming directly from relevant websites. The process of building links should not be confused with being listed on link farms, as the latter requires reciprocal return links, which often renders the overall backlink advantage useless. This is due to oscillation, causing confusion over which is the vendor site and which is the promoting site.