Using the same service or accessing the same files from different devices like phones, tablets, and computers. Like having keys that work on all your doors.
Multi-device access lets you start watching a movie on your tablet and continue watching it later on your TV or phone.
Multi-Device Access is a user experience capability (accessing the same app/data across phone, tablet, and computer), not a single cloud provider service. It’s typically enabled by a combination of identity (sign-in), cloud storage/sync, and application state synchronization services on each platform.