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Rich snippets can boost your site's performance dramatically in two major fashions, by increasing visibility to the search engines, improving CTR (click through rate) and building greater profitability.

They do this on two closely related fronts. Search Engine Results Pages First, by implementing RDFa rich snippets, microdata or microformats, data can be categorized per a specific ontology, which classifies the data very specifically, in a manner that allows the search engines to understand precisely what is meant.