Keyword density 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 to determine whether a web page is relevant to a specified keyword or keyword phrase.

What is Keyword Density?
 

What is good keyword density? While there are no hard and fast rules for keyword density beyond always-relevant "don't keyword stuff" advice, many SEOs recommend using approximately 1-2 keyword for every 100 words of copy. That factors in to about 1-2% keyword density.

Using keyword density, search engines use this information to classify what a website is about and determine which terms a website relates to. A perfect keyword density will help you achieve higher positions in search engines. Keyword density should be balanced