A Microsoft file hosting and synchronization service.
This is a pretty awful problem. I installed it on my previous 2017 Macbook Pro which only had 256 Gig Hard drive. It took up 3/4 of my entire drive. When I tried to uninstall it, the files still took up the “other” storage bucket. A true nightmare that I desperately tried to solve.
Now with my new machine, I refuse to install One Drive. I use Cyber Duck or Mountain Duck to access my files. When Apple One comes out, I may move all my files out to their cloud and cancel my Office subscription all together (we can just use my husbands school access to Office).
I would prefer not to do this. Please make fixing this a priority.