Apps and features that use iCloud
See a list of the apps and features that use iCloud to keep content up to date and let you share with others.
Apple Support
iCloud helps you keep your most important information—like your photos, files, backups, and more—secure, up to date, and available across all your devices.

When you sign in on a new Apple device, key features of iCloud like iCloud Photos, Backup, iCloud Drive, and more are set up automatically. You can turn these on or off at any time and customize the settings for each device. See Sign in to iCloud on all your devices.