Hlo Friends,
Can anyone tell me, What is Keyword Density?

For information about keyword density read this http://www.microsystools.com/products/keyword-research/help/website-seo-page-content/ and http://www.microsystools.com/products/keyword-research/help/keyword-density-analyzer-tutorial/

Essentially have title, headers and body text contain similar or related keywords

Keyword density is the percentage of times a keyword or key phrase appears on single web page compared to the total number of words on the page.

Keyword density will help to stand out your content from others

keyword density can be used to determine whether a web page is relevant to a specified keyword or keyword phrase.

Keyword Density tell you how often a search term appears in a text  in relation to the total number of words it contains. Keyword density is the percentage of times a keyword appears on a web page in comparison with the total number of words on a page.

The answers above were almost all correct. just remember, you should write for your visitors and not search engines. density of 7 to 13% is ok for a keyword and any more than that would be recognized as over optimizing and would hurt your site.

Keyword density is how often a search term appears in a text in relation to the total number of words it contains.This is the keyword density

Keyword density is a measure of the relative importance of a keyword on a given page, based on its rate of occurrence. Keyword density may be a factor in some search engines' ranking algorithms.

keyword density is use to check the all information are relevant or not and it is also use to check the grammar and spelling mistakes.

Keywords are the words that are used whenever anything is searched on the search engine. These keywords must be mentioned in the content of our website but care must be taken of the fact that these keywords do not exceed more than 5%. Or it will be termed as spam.

It is a number of times a keyword appears on web page compared to the total no of words present on page.