TripAdvisor provides three key services to help travelers plan trips: a search engine to find destinations and hotels, user reviews to help travelers decide where to go, and now tools to directly book hotels through their site. The document discusses TripAdvisor's success is built on user generated content with over 150 million reviews. It also highlights the importance of mobile access, with half of TripAdvisor's traffic now coming through smartphones and tablets, and introduces their Instant Booking tools to streamline the booking process directly within the TripAdvisor interface.