Okay, so now you have your final list of keywords that are relevant to your service, product or company, and searched for regularly by your target consumers. Now that you have this information, what are you going to do with it? You need to rewrite the content of your site, or ensure that when the content is written, it includes the keywords wherever it is appropriate. Use them as often as you can in any context that is applicable, but not to the point where it may become tediously repetitive. Not only will your visitors find this off-putting, but the search engines may penalize you for it if it is anything close to spamming.
Keyword density is a calculation of how many times your keywords are used in a page divided by the number of words on the page. To a certain degree, the higher this figure is, the better. There are plenty of keyword density analyzers that calculate keyword density for given URLs, so it makes sense to check the keyword densities of successful, highly ranked sites and to try to match this figure in your own pages. Different search engines will work keyword density into their algorithms differently, so matching the figure exactly is not strictly necessary; really, this depends on which search engine you are optimizing for.
While keywords are well suited to body text, don’t forget to make use of them where you can in the underlying HTML layer as well: title text, header text, anchor text, alt text, meta-tags and comments or the page title also make excellent repositories for strategic keyword placement. Do not under any circumstances use underhanded keyword placement methods; filling the background of the page with keywords that are the same color as the background so that they do not appear to visitors, or other such tricks, are more likely to get you removed from the search engines index than ranked highly.
Choosing Keywords 
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