Unicorn and media-magnet Airbnb has always been great at communicating who it is and what it does. Airbnb brought hotel alternatives like mushroom dome cabins, treehouses, and your buddy’s San Francisco studio into the mainstream, leading it to a $25.5 billion valuation and a reputation as a hotel industry-killer. However, it more immediately challenges online travel agencies (like Priceline Group) and their $200 billion in annual bookings. Priceline, meanwhile, is the Airbnb of 1999, all grown up. The once-buzzy company known for its commercials starring William Shatner faced hard times when the dot com bubble burst, but has since rebuilt itself into a massive $66 billion company with six core brands: Priceline.com, Open Table, Agoda, RentalCars.com, Kayak, and perhaps the most direct Airbnb competitor, Booking.com. Altogether, Priceline Group raked in $2 billion in quarterly revenue and $374 million in profits in the spring of 2016. Part of the reason for that success? Powerful acquisitions and a focused vision. Airbnb needs Priceline’s money-making prowess, while Priceline needs Airbnb’s powerful branding. Here's how the two rivals compare. Get the full story at Fast Company