Here’s an example of an aggregate rating that’s nested in a Product along with Review to demonstrate user reviews.
A user review refers to a review written by a user or consumer for a product or a service based on her experience as a user of the reviewed product.
Popular sources for consumer reviews are e-commerce sites like Amazon.com, Zappos or lately in the Yoga field for schools such as Banjaara Yoga and Ayurveda, and social media sites like TripAdvisor and Yelp.
Source: Nested review, User Reviews.