iCloud.

About iCloud

iCloud is a personal cloud service run by Apple. Launched on October 12, 2011, iCloud enables users to store and sync data across devices, including Apple Mail, Apple Calendar, Apple Photos, Apple Notes, contacts, settings, backups, and files, to collaborate with other users, and track assets through Find My. iCloud's client app is built into iOS, iPadOS, watchOS, tvOS, macOS, and visionOS, and is available for Microsoft Windows. iCloud may additionally be accessed through a limited web interface.