Keyword density is a number describing how often does a specific phrase appear in a piece of text. To calculate it you just have to divide the number of times your keyword appears in a piece of text by the total number of words this piece of text has, and then multiply the result by 100. The final result will be expressed as a percentage score.
Keyword density is believed to have an effect on SEO. The reasoning behind it is that if a given phrase has a high density score then it means that the text is clearly about that phrase, so it probably should get good rankings for it. Unfortunately this practice doesn’t work so well like it used to in the past.« Back to Glossary Index