PowerPoint - sharing and working collaboratively
When you have a subject matter that is shared across the department you can share your Presentation but also you can work on it together remotely at the same time. This can save needless(endless) emails and also save time, a brief overview is explained via this link from Microsoft :
https://support.microsoft.com/en-us/office/work-together-on-powerpoint-presentations-0c30ee3f-8674-4f0e-97be-89cf2892a34d
This can also done for other types of document like Word and Excel.