In regards to search results, it is a method that search engines such as google use to determine relevance of a page based on phrases acutally used in a document. For example, if you have a page instructing people on wildlife photography, the search engine would reasonably expect to see terms and phrases such as "selecting a camera", "appraoching wildlife", and "low light photo conditions". Related phrases will add to the relevance of a page where unrelated phrases will reduce the relevance of a page. This is one technique that Google is using to weed out "spam" sites.
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