Today, Apple pushed out the public releases of all its operating systems, including iOS/iPadOS, macOS, watchOS, and tvOS. These releases include new features across all platforms, not just bug fixes or security updates.
As usual, the iOS and iPad update (iOS and iPadOS 15.4) is the most major in terms of number and breadth of changes. The two biggest new features are arguably Universal Control support for the iPad and the ability to use Face ID while wearing a protective face mask.
To use Face ID with a mask, users must opt in to the capability in Settings. And Universal Control, which allows users to control both a Mac and an iPad seamlessly with the same input devices, requires both an iPad and a Mac on the latest software releases.