iCloud: What is iCloud?
iCloud securely stores your photos, videos, documents, music, apps, and more—and keeps them updated across all your devices. It lets you easily share photos, calendars, locations, and more with friends and family. You can even use iCloud to help you find your device if you lose it.
How iCloud works
After you set up iCloud on your iOS device or Mac, you sign in to iCloud on your other devices and computers using the same Apple ID (you only need to do this once). After that, changes you make on one device appear on all your other devices. For example, if you create a new album in Photos on your Mac, the album automatically appears in the Photos app on iCloud.com on Mac and Windows browsers, your iOS devices, your Apple Watch, and your Apple TV.
Note: If you have a Windows computer and don’t have a Mac or iOS device, you can get iCloud web-only access to use Notes, Contacts, iCloud Drive, Pages, Numbers, and Keynote from your browser. See the Apple Support article Web-only access to iCloud.
To sign up for iCloud, you need an Apple ID. If you don’t have one, you can create one when you sign up.
iCloud comes with 5 GB of free iCloud storage. You can upgrade to more storage for a small monthly charge.
Note: Some iCloud features have minimum system requirements. iCloud might not be available in all areas, and iCloud features might vary by area. See the Apple Support article System requirements for iCloud.