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The keyword density checker, or keyword density, indicates the relationship keyword - text on a web page, and therefore the proportion between a web text and the repetitions of the single key.
At the beginning of SEO, keyword density was considered a factor of primary importance, to the point that webmasters dedicated themselves to uncontrolled keyword stuffing practices, obsessive repetition of the keyword without any limit.
Today, however, keyword density checker must be managed critically, because otherwise there is a risk of penalties.