A Microsoft file hosting and synchronization service.
You don't have to wait for 2 hours before you sync your files - you can (and probably should) restart OneDrive immediately by launching the OneDrive app from your taskbar after you stopped it.
Please note - if you want to ensure that files are in sync both on your desktop and laptop - do this on both of them, starting on the PC where you actually made your latest changes.
On top of that, you can avoid all these manual mouse clicks and automate the initiation of the sync process with a batch file to first stop the OneDrive app and then restart it again, I already posted such solution in this thread, I hope that there is no need to repeat it ad nauseum.