Google will display a snippet with every search result. For example, if you're searching for a recipe for “homemade sponge cake” and you Google this particular search term, you'll see a list of results containing both rich snippets and normal snippets.
A normal snippet shows the URL in green, the title in blue and a brief description.
A rich snippet will show additional information between the URL and the description. For example, a picture of a sponge cake will be added, and you will also see the recipe's rating, how long it takes to prepare and how many calories it contains.