Combined with the Universal Control feature, it will now allow a single mouse, Trackpad and keyboard to be used across multiple Mac and iPad devices. The innovations that users really expect are in the ecosystem features.
Additionally, it includes features like SharePlay for iMessage, redesigned tabs for Safari, live text support for photos, grid views, and spatial audio for FaceTime. MacOS Monterey includes quite a few changes to the operating system, including Shortcuts, Quick Note, Universal Control with all Apple hardware, AirPlay to Mac, and Focus.