Review sites are online platforms where users can share their opinions and experiences about products, services, or businesses. These sites often feature ratings, written reviews, and sometimes photos, helping potential customers make informed decisions. Popular examples include Yelp, TripAdvisor, and Amazon. Users can search for specific items or services and read feedback from others. Review sites can cover a wide range of categories, including restaurants, hotels, electronics, and more. Businesses often monitor these reviews to improve their offerings and address customer concerns, making them valuable for both consumers and companies.