fman is an alternative to file managers such as Explorer on Windows or Finder on macOS. You use it to browse directories, copy or move files, mount external drives, etc. It lets you perform these tasks much more efficiently than other file managers.
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.
Enable snapd
On Debian 9 (Stretch) and newer, snap can be installed directly from the command line: