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In 2006, Google ousted BMW for using "doorway pages" to the company's German site, The specific presentation of content on these sites is unique, but is merely an amalgamation of content taken from other sources, often without permission.
People screening websites for a search-engine company might temporarily or permanently block an entire website for having invisible text on some of its pages.
They all aim at variants of the vector space model for information retrieval on text collections.
Keyword stuffing involves the calculated placement of keywords within a page to raise the keyword count, variety, and density of the page.
It could be considered to be a part of search engine optimization, though there are many search engine optimization methods that improve the quality and appearance of the content of web sites and serve content useful to many users.
Search engines use a variety of algorithms to determine relevancy ranking.