What is Keyword Density?
Keyword density is the measurement in percentage, the number of times a keyword or phrase appears compared to the total number of words in a 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. Due to the ease of managing keyword density, search engines usually implement other measures of relevancy to prevent unscrupulous webmasters from creating search spam through practices such as keyword stuffing.
Supporters’ Viewpoint:
The keyword density tool is useful for helping webmasters and SEOs achieve their optimum keyword density for a set of key terms.
Keyword density is important because search engines use this information to categorize a site’s theme, and to determine which terms the site is relevant to. The perfect keyword density will help achieve 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 engine spiders, it will filter out common stop words (since these will probably be ignored by search engines). It will avoid filtering out stop words in the middle of a term, however (for example: “designing with CSS” would go through, even though “with” is a stop word).
Objectors’ Viewpoint:
Please note that keyword density is a fairly meaningless measure of relevancy, but using a keyword density analysis tool can make it easier to find a few good keyword phrases to use.
Dr. E. Garcia explained why keyword density was a bad measure of relevancy in The Keyword Density of Non Sense.
* Search engines may place significant weight on domain age, site authority, link anchor text and usage data.
* The page title is typically weighted more than most any other text on the page.
* The meta keywords tags, comments tags, and other somewhat hidden inputs may be given less weight than page copy.
* Page copy which is bolded, linked, or in a heading tag is likely given greater weighting than normal text.
* Weights are relative. If your whole page is in an H1 tag that looks shady, and it does not place more weight on any of the text since all the page copy is in it.
* You probably want to avoid doing things like bolding H1 text as it is doubtful it will make a page seem any more relevant.
* Lots are queries are a bit random in nature. When people tweak up page copy for an arbitrarily higher keyword density they typically end up removing some of the modifier terms that were helping the page appear relevant for many 3 and 4 word search queries.
* Semantic related algorithms, may look at supporting vocabulary when determining the relevancy of a page. If you pulled the keyword phrase you were targeting out of your page copy would it still be easy for a search engine to mathematically model what that phrase was and what your page is about given the supporting text?
* When people focus too much on keyword density they tend to write content which people would not be interested in reading or linking at.
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