When you sign up for iCloud, you automatically get 5GB of free storage. iCloud storage is used for iCloud Mail and to back up your photos, videos, device settings, messages, and more. iCloud Drive and iCloud-enabled apps, like Keynote, Pages, and Numbers, also use iCloud storage to keep files up-to-date across your devices. Learn how to manage your iCloud storage
or how to upgrade
if you need more storage.