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With the keyword density engine you can find out on a specific URL how many times you can find the keywords for all the words that are on the page. The frequency of keywords is therefore important, because the more common a word is on a page, the greater the chance, the site is the object, the idea or the notion that is expressed in that word. (It's not good, however, to find the keyword too often on the site, because in this case the site may receive SEO penalty). Generally speaking, it is ideal that the keyword frequency, after which we do search engine optimization, is between 2 - 8%.