KAYAK is a travel search site. Like a search site, Kayak helps you find what you want, but specialized. Kayak's tools are made to deeply understand things like airfares and hotel stays. Like a travel site, Kayak has flights and hotels. But Kayak don't actually sell plane tickets, hotel rooms, or anything else.
Kayak helps people find the best travel choices easily by searching the data from hundreds of travel sites at once. Compare options, and when you find something that fits your budget and tastes, book it where you want: at the airline site, from the hotel, or from a travel agent.