iCloud Drive stores your presentations, spreadsheets, PDFs, images, and other kinds of documents so that you can access these documents from any of your devices set up with iCloud. It also allows your apps to share documents so that you can work on the same file across multiple apps and collaborate on them with others in real time.
iCloud Drive works with iOS devices using iOS 8 or later, iPadOS devices, Mac computers using OS X 10.10 or later, and PCs with iCloud for Windows. You can also access iCloud Drive through iCloud.com.
To access iCloud Drive, you must be signed in to iCloud with your Apple ID. iCloud Drive works with supported apps including Pages, Numbers, Keynote, GarageBand, and some developers other than Apple.