Microsoft introduced Fluid Framework, a software development kit

This MS tool will help developers build and release their applications quickly.
The Fluid Framework will change the way people look for Collaborative editing on web and document.

Users can say, create a document in an application like Word, share in Microsoft Teams. All of the changes sync in real time, of course.

This technology is nothing new but promises fast speed and synchronization.

Microsoft’s demos

Link for more detail

https://www.microsoft.com/en-us/microsoft-365/blog/2019/05/06/build-2019-people-centered-experiences-microsoft-365-productivity-cloud/