Keyword Density The number of times a keyword or keyword phrase with the ratio in other words, appears on a Web page is a combination of. More often in relation to the total number of words keyword page appears, the greater the overall keyword density. Other words that appear more often, the low ratio of keywords, keyword density, resulting in a lighter.
Google, various search engines including Yahoo, and MSN Search as part of their search algorithm Consider keyword density. Each search engine a different mathematical keywords that is rewarded with higher search ranking placement in the density equation. There is also the degree of density permitted before a penalty is imposed as a different level of tolerance between different search engines.
Keyword density is a very important part of search engine optimization. Keyword density is the percent that your keyword or keyword phrase are of your web page text. You may want to look that your competition to see what keyword density they are using. To high a keyword density will be considered search engine spam and can get you blacklisted.
Your keywords should be toward the top of your page and your keyword phrase be in either every paragraph or every second paragraph depending on your paragraph length.

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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