iCloud Drive stores your presentations, spreadsheets, PDFs, images, and other kinds of documents in iCloud so you can access these documents from any of your devices set up with iCloud. It allows your apps to share documents so you can work on the same file across multiple apps.
iCloud Drive works with iOS devices using iOS 8, Mac computers using OS X Yosemite, PCs with iCloud for Windows, or 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 third-party apps.