What is Keyword density / saturation ?

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Hi members,
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 as a factor in determining whether a web page is relevant to a specified keyword or keyword phrase.
Have you any idea about this?

[watson123]

Keywords are the major factors of SEO success. A Keyword describes what the page is about. When you have keywords in tittle and headings, it would be good for ranking. The higher the keyword density for a particular keywords, the better you rank for the keyword in search results.

[jamsen]

Keyword density is a combination of the number of times a keyword or a keyword phrase, in proportion with other words, appears on a Web page. The more times the keyword appears in relation to the total number of on page words, the greater the overall keyword density. The more times that other words appear, the lower the proportion of keywords, resulting in a lighter keyword density.