RelayRides is a peer-to-peer carsharing service. It allows private car-owners to rent out their vehicles on a short-term basis, via an online interface. [1]

The carsharing concept of RelayRides was architected by founder Shelby Clark who proposed a peer-to-peer model because "we already have this massive resource in our communities" of underutilized vehicles.[2][3] He added, "It’s for the community, by the community."[3]

People who wish to profit from their cars while they're not being used can register the cars online to be borrowed by other RelayRides members.

[1] "Video - Make money letting others drive your car"

[2] Ken Belson (2010-09-10). "Baby, You Can Rent My Car". New York Times

[3] RelayRides, Out to Be the Community-Powered Zipcar, Hits the Ground With Pilot Rental Program