Keyword density. That’s a term that refers to how many times you use a certain keyword phrase on a web page as a percentage of the total number of words on that page.
Some people offering SEO services hammer on about making sure your text has a certain keyword density (e.g. that 3% or 6% or whatever of your text should consist of your targeted keywords).
Well, guess what? That’s nonsense. (And don’t just take it from me, listen to Google. See Matt Cutt’s webmaster video below.)