Including structured data markup in web content helps Google algorithms better index and understand the content. Some data can also be used to create and display Rich Snippets within the search results. For example, the Rich Snippet at the right shows search results for a movie, including review stars, an aggregate rating value, and vote count — very useful to anyone searching for information about this movie.
To make your pages eligible for Rich Snippets in search results, add structured data of the appropriate type to your content. Make sure to comply with any policies that each type has regarding Rich Snippet display. Google supports Rich Snippets for the following data types:
- Product -- Information about a product, including price, availability, and review ratings.
- Recipe -- Recipes that can be displayed in web searches and Recipe View.
- Review -- A review of an item such as a restaurant, movie, or store.
- Event -- An organized event, such as musical concerts or art festivals, that people may attend at a particular time and place.
- SoftwareApplication -- Information about a software app, including its URL, review ratings, and price.
Once you've marked up your site's content, you can test it using the Structured Data Testing Tool. Google will discover it the next time we crawl your site (although it may take some time for rich snippets to appear in search results). When our algorithms discover technically correct markup on a page, we use a variety of signals to determine when to show rich snippets, including compliance with our Webmaster Quality Guidelines and Structured Data Policies. As a result, correctly marked up content may not always trigger rich snippet in our search results.