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For instance, keyword tools are indispensable, perhaps the most powerful SEO tools in any webmaster's toolbox. A well chosen and well programmed set of keyword tools can make it possible for you to list the keywords your web pages target, track their ranking in search engines by keyword, measure your pages' keyword density, and compare your site with your competitors' sites, allowing you to improve your targeting and fix false targeting. You can also develop new pages with keyword tools by using keyword generators to create lists of promising new keywords, evaluate likely traffic by keyword, and generate lists of commonly mistyped variants of your keywords for extra targeting. You can also accidentally oversaturate your keywords by choosing the wrong keyword density, pick keywords that search engines have flagged as undesirable, or make any of a legion of SEO errors that can put your site on spam lists. Because real spam merchants are excellent at showing search engines what they want to see, search engines constantly revise their algorithms, changing their "opinion" of overused Seo tricks.