Radarr (Movies) / Sonarr (Shows/Series) - You search for a movie/show, you hit the “I want that” button, it does the searching through Torrents or Usenet, once it find a match it send a signal to your download client to begin downloading, once done Radarr/Sonarr will take that file and neatly manage it for your media viewer (Jellyfin) essentially automating the entire process.

There is quite a bit of configuration needed for things start to flow smoothly but relatively straight forward.