Ranking tools and the stuff nobody tells you
The webmaster packs the page title and page body with keywords, sometimes relevant to the page and sometimes completely off the wall. Some webmasters stuff the keyword meta tag as well, although this is one of the oldest black hat SEO techniques and has caused most search engines to ignore the keyword meta tag. To avoid being penalized for this common Seo mistake, give your pages natural sounding titles and do not put any text on the page that does not pertain to the page's topic. More sophisticated webmasters spread out the keywords within the body of the text instead of piling them in a single paragraph. Search engines filter out pages that use this SEO trick by giving preference to pages with a certain keyword density, and penalizing pages whose keyword density is higher.