Search engine optimization (SEO) has become a common term and SEO as a profession is approved by the major search engines but only as long as one does not cross the line and engages in the use of black hat SEO techniques. The differentiation between black hat and white hat SEO is quite clear. Spamdexing (or Spam Indexing) is a black hat SEO technique that heads the list and must be avoided by any self respecting SEO professional.Spamdexing is mainly about the different methods used to manipulate the relevancy or prominence of resources indexed by a search engine, in a manner inconsistent with the purpose of the indexing system. One of the most popular methods under this category is done by the repetition of irrelevant phrases in the text. Another method quite similar to spamdexing is called Google bombing and involves the practice of deliberately modifying HTML pages so that it increases the chance of the pages being placed almost at the beginning of search engine results. Such modifications are also done to falsely categorize a webpage.One cannot forget the Political Google bombs that were used during the 2004 US Presidential elections, nor the first Google bomb that was directed against Microsoft. Google wanted to preserve the integrity of its search engine and had taken a passive stand to these attacks but later changed their indexing structure. More details are available at,http://en.wikipedia.org/wiki/Political_Google_bombs
Spamdexing is basically of two types,
While content spamming techniques consists of making doorway pages, keywords stuffing, having hidden / invisible irrelevant text, “made for adsense” sites, and Meta tag stuffing; link spamming is basically about having links between web pages that are present for reasons other than merit.
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