Airbnb was founded in 2008 to address the problems of expensive hotels that isolate travelers from local culture and the lack of an easy way for people to book stays with locals or become hosts themselves. Airbnb operates a website and mobile app that functions as an online marketplace connecting travelers with hosts offering local accommodations ranging from entire homes to individual rooms. Airbnb earns commissions on bookings and has grown rapidly since launching, reaching over $4 billion in total funding and $2.6 billion in revenue by 2017.