bleepingcomputer[.]com/news/microsoft/windows-11-kb5079391-update-rolls-out-smart-app-control-improvements/
learn.microsoft[.]com/en-us/windows/apps/develop/smart-app-control/overview
support.microsoft[.]com/en-us/windows/smart-app-control-frequently-asked-questions-285ea03d-fa88-4d56-882e-6698afdb7003
learn.microsoft[.]com/en-us/windows/security/application-security/application-control/app-control-for-business/appcontrol#smart-app-control-enforced-blocks
The big news with this update is that it allows you to turn on Smart App Control without needing to install a fresh copy of Windows. That's assuming of course that you want to turn it on. A very basic way of describing Smart App Control is to think of it as fully automatic white listing, where only approved apps & files are permitted to run.
Smart App Control ensures only signed code runs or code predicted to be safe by our intelligent cloud-powered security service.