Channel manager

A channel manager is software that connects your property to the online travel agencies (OTAs) you list on — such as Airbnb, Booking.com, Vrbo and Expedia — and keeps them all in sync.

When a guest books on one channel, your availability updates everywhere else within seconds, so the same room is never sold twice. Rates and restrictions go out to every channel from one screen, instead of logging into each extranet by hand. For anyone selling on more than one site, it's what makes overbookings a non-issue.