Keyword density is the percentage of times a keyword or keyword phrase appears on your webpage compared to the total number of words on the webpage.
In the context of SEO; search engines use keyword density as a factor in determining whether a webpage is relevant to a specified keyword or keyword phrase being searched.
It is important for your main keywords to have the correct keyword density to rank well in Search Engines.
Using your keywords too many times on your webpage may result in search engines labeling your webpage as spam.
Not using your keywords enough times may result in search engines not ranking your webpage high enough in the search results.
The recommended density for keywords within webpage text is 3%.
This means that if your webpage contains 100 words, your keywords should appear no more than 3 times.
One of the simplest ways to improve your website's placement in search engine results is to work on the keyword density of your Webpage.