What is keyword density to start with, keyword density according to Wikipedia is:

“is the percentage of times a keyword or phrase appears on a web page compared to the total number of words on the page. In the context of search engine optimization keyword density can be used as a factor in determining whether a web page is relevant to a specified keyword or keyword phrase.”

Basically, a 5% keyword density in a 100 words article means that a certain keyword is mentioned 5 times on the article.
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