TripAdvisor, Inc. is an American travel and restaurant website company that shows hotel and restaurant reviews, accommodation bookings and other travel-related content. It also includes interactive travel forums.
Headquartered in Needham, Massachusetts, TripAdvisor is the largest "social travel website" in the world, with about 315 million reviewers (active and inactive) and over 730 million reviews of hotels, restaurants, attractions and other travel-related businesses. TripAdvisor was an early adopter of user-generated content. The website services are free to users, who provide most of the content, and the website is supported by a hotel booking facility and an advertising business model.
TripAdvisor Media Group operates 25 travel brands including TripAdvisor, Airfarewatchdog, BookingBuddy, Citymaps, Cruise Critic, Family Vacation Critic, FlipKey, GateGuru, Holiday Lettings, Holiday Watchdog, Independent Traveler, Jetsetter, lafourchette, Niumba, OneTime, SeatGuru, SmarterTravel, Tingo, TravelPod, Tripbod, VacationHomeRentals, Viator, and VirtualTourist. TripAdvisor operates websites internationally.
According to en.wikipedia