Expedia is the world's second-largest online travel agency by bookings, offering services for lodging (80% of total 2023 sales), air tickets (3%), rental cars, cruises, in-destination, and other (11%), and advertising revenue (6%). Expedia operates a number of branded travel booking sites, but its three core online travel agency brands are Expedia, Hotels.com, and Vrbo. It also has a metasearch brand, Trivago. Transaction fees for online bookings account for the bulk of sales and profits.