It Is Part Of The Growing “Share Economy”
The “share economy” refers to the start-ups that allow people to use the things that they already have but may not always use to earn extra money. Uber will enable people who own a car to make extra money by driving people around; they get paid for driving their own vehicles, while passengers save on what would be an otherwise expensive taxi fare.
With Airbnb, people share a room that they already have in their own homes. They can earn passive income by allowing travelers to stay in that room, though they do have to make sure that the place remains clean.