SEO-Lexicon
Natural Listings
The results lists, where the positions weren't bought (like e.g. sponsor links), of a search engine are called natural listings. The task of search engine optimization is, that your page gets the best possible position. In order to achieve this position, there is a whole series of techniques, such as linking to other relevant pages or the optimization of the used keywords. Since search engines exist, there is a technological race between the robots and the search engine optimizers, in which it is about to beat the other one.
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Natural Listings: lexicon search engine optimization