Booking Holdings runs the world's largest online travel agency, anchored by Booking.com's dominance in European hotel reservations, where fragmented independent properties depend on it for demand. Priceline, Agoda, Kayak and OpenTable extend the family across regions and categories. The model takes a commission on reservations while owning no hotels, converting travel demand into cash with little capital. Flights, payments and a connected-trip vision aim to keep travelers inside the ecosystem from search to checkout.