OneDrive is the Microsoft cloud service that connects you to all your files. It lets you store and protect your files, share them with others, and get to them from anywhere on all your devices. When you use OneDrive with an account provided by your company or school, it's sometimes called "OneDrive for work or school." It used to be known as "OneDrive for Business," so you may still see it called that in places.

For more information, including tutorials visit Microsoft's Support web site at 
https://support.microsoft.com/en-us/office/what-is-onedrive-for-work-or-school-187f90af-056f-47c0-9656-cc0ddca7fdc2