The first is to determine what the site is about. This is important because otherwise the search engine would display irrelevant sites for queries. For example, if the site is mainly about Cars, but happens to mention the phrase 'Holy' once, the site shouldn't be pulled up for queries for 'Holy'. A search engine makes this distinction by looking at the relative density of the keywords and phrases on the site. The term 'keyword density' has gone out of fashion, and absolute measures of keyword...
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