The document discusses online travel distribution and affiliate marketing. It notes that most online bookings are made through various online sources like metasearch engines, booking sites, reviews sites, and that brands must decide how to get bookings across these channels. It then provides details on affiliate marketing, how it works, common payment models, the roles of affiliate networks and agencies. It discusses how affiliates promote advertisers and how sales are tracked. Finally, it offers tips on setting up an affiliate marketing strategy, including designing the program, providing tools to affiliates, recruiting affiliates, and measuring and paying affiliates.