KAYAK is a travel search engine that allows users to search for flights, hotels, and rental cars. The company was founded in 2004 and is headquartered in Stamford, Connecticut. KAYAK's website and mobile app allow users to compare prices from hundreds of travel sites with just one search. The company also offers a variety of tools and features to help users plan and book their travel, including price alerts, itinerary management, and travel guides. KAYAK is part of Booking Holdings, which also owns other travel brands such as Booking.com, Priceline, and OpenTable.