At Google, we’ve supported structured markup for a couple years now. We introduced rich snippets in 2009 to better represent search results describing people or containing reviews. We’ve since expanded to new kinds of rich snippets, including products, events, recipes, and more.
Example of a rich snippet: a search result enhanced by structured markup. In this case, the rich snippet contains a picture, reviews, and cook time for the recipe.
Adoption by the webmaster community has grown rapidly, and today we’re able to show rich snippets in search results more than ten times as often as when we started two years ago.