Intro to Rich Snippets
Google tries to present users with the most useful and informative search results. The more information a search result snippet can provide, the easier it is for users to decide whether that page is relevant to their search. With rich snippets, webmasters with sites containing structured content—such as review sites or business listings—can label their content to make it clear that each labeled piece of text represents a certain type of data: for example, a restaurant name, an address, or a rating.
Providing this information doesn't affect the appearance of your content on your own pages, but it does help Google better understand and present information from your page. (Learn more about rich snippets for Local Search.)
The image below displays a rating and price range—very useful to anyone searching for information about a restaurant.
This kind of markup is designed for sites containing specific types of structured data. Google currently supports the following information types: reviews, people profiles, products, business listings, recipes, and events.
For more information, visit our Help Center.