OneDrive for Business is O365's enterprise cloud-storage system. With OneDrive for Business you can keep your documents secure and up to date with auto-save and version control features.
You can use OneDrive to share files or entire folders with people. The files and folders you store in OneDrive are private until you decide to share them and you can see who a OneDrive file is shared with or stop sharing at any time.
With OneDrive, you can sync files between your computer and the cloud, so you can access your files from anywhere. If you edit a file in your OneDrive folder, is also changed across all your devices. So you and your documents are always up to date.