Question: what is the difference between i cloud and i cloud drive?
Answer: iCloud is, of course, Apple's online storage service, but it's not a file-sharing service like Dropbox or Microsoft OneDrive. (That's where iCloud Drive comes in; see below.) Rather, it serves to back up much (but not all) of what's stored on your iDevice, while syncing some (but not all) of your data to other devices.