Booking Holdings Inc. is an American travel conglomerate based in Norwalk, Connecticut. Its main services are travel and restaurant online reservation and related services. Its best-known brands include booking.com, priceline.com, agoda.com, rentalcars.com, KAYAK and OpenTable Inc. This digitally driven firm develops and deploys travel fare aggregators and travel fare metasearch engines in roughly 40 languages and 200 countries. Its flagship brand, booking.com, was responsible for helping worldwide consumers book almost 600 million room nights of accommodations in 2021.