The keyword density tool is useful
for helping webmasters/SEO's achieve their optimum
keyword density for a set of key terms/keywords.
Keyword density is important since
search engines use this information to categorize
a site's theme, and to determine which terms this
site is relevant to -- the perfect keyword density
will help archive higher search engine positions.
Keyword density needs to be balanced correctly (too
low and you will not get the optimum benefit, too
high and your page might get flagged for 'keyword-spamming').
This tool will analyze your chosen
URL and return a table of keyword density values for
one, two, or three word key terms. In an attempt to
mimic the function of search engines spiders, it will
filter out common stop words (since these will likely
be equally ignored by search engines), it will avoid
filtering out stop words in the middle of a term (for
example: 'designing with CSS' would get through, even
though 'with' is a stop-word).