A
computer reservations system or
central reservation system (
CRS) is a
computerized system used to store and retrieve information and conduct transactions related to
air travel, hotels, car rental, or activities. Originally designed and operated by
airlines, CRSes were later extended for the use of
travel agencies. Major CRS operations that book and sell tickets for multiple airlines are known as
Global Distribution System (GDS). Airlines have divested most of their direct holdings to dedicated GDS companies, who make their systems accessible to consumers through
Internet gateways. Modern GDSes typically allow users to book
hotel rooms,
rental cars, airline tickets as well as activities and tours. They also provide access to railway reservations and bus reservations in some markets, although these are not always integrated with the main system.