> One of Flatpak’s main goals is to increase the security of desktop systems by isolating applications from one another. This is achieved using sandboxing and means that, by default, applications that are run with Flatpak have extremely limited access to the host environment.
> It is advertised as offering a sandbox environment in which users can run application software in isolation from the rest of the system.
https://en.wikipedia.org/wiki/Flatpak
> flatpak(1):
> ... isolated from the host system ('sandboxed') to some degree, at runtime.
http://manpages.org/flatpak
> One of Flatpak’s main goals is to increase the security of desktop systems by isolating applications from one another. This is achieved using sandboxing and means that, by default, applications that are run with Flatpak have extremely limited access to the host environment.
https://docs.flatpak.org/en/latest/sandbox-permissions.html
And a lot more
https://www.google.com/search?q=flatpak+sandbox