it is how many timnes your keyword appears in piece of text. I try not to go over 5%. If you have ezinearticles.com, then you can copy and paste your content in the body section of a new article and it will immediately tell you if vthe keyword density is too high. You also get suggested keywords !
It depends on how long is the text on your page. If there are a lot of texts then it should be around 2-4 per cent, but shouldn't be more than 10-11 per cent.
Sometimes a website or blog traffic up and down encouraging them to use the keyword or keywords that are special.
The preferred keyword density ratio varies from search engine to search engine. In general, I recommend using a keyword density of around 2-8%. Want to use this tool keyword analysis in real time to help you optimize the keyword density of web page.
keyword density means how many times your keywords appears/present in your web page.generally 2-4% keyword density is good for any website.