The xclock package contains a simple clock application
which is used in the default xinit configuration. This package
is not a part of the Xorg katamari and is provided only
as a dependency to other packages or for testing
the completed Xorg installation.
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.