Plex for Linux is your client for playback on the Linux desktop. It features the point and click interface you see in your browser but uses a more powerful playback engine as well as some other advance features.
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.