The Reviews SERP Feature is used to show the feedback of web users to certain items in search results, such as recipes or movies. It will display both the total number of reviews given to each item, and the average rating. This gives web users a quick way to determine which option in search results listings they are interested in learning more about.
The Reviews SERP Feature also appears below a webpage’s URL when it has been reviewed on Google. In this case, there will also be physical stars to depict a webpage’s rating, giving web users an idea of the way that other web users regard that webpage and the content on it.