Servarr is a stack of applications that sets up a media suite. Radarr and Sonarr handle the managing of movies and TV shows, respectively. Prowlarr searches for the media through either Torrenting or Usenet. Then you'd need a downloader like SABnzbd or Deluge. Ombi is another application to handle requests and finally you'd need a streaming app like Plex, Emby or Jellyfin.

Think of it like a marionette; you're making a bunch of services work together for one goal. Most people use docker and create a docker compose file to manage all the services. Typically the flow goes like this, a person makes a request to Ombi for something to watch. That request goes to Radarr or Sonarr, which creates a folder and populates the Metadata from IMDB. Then a request is sent to Prowlarr to find the media. Once found its sent to the downloader, like Deluge, to actually grab the media. After it's done, Radarr / Sonarr will import the media into the correct folder. Now you've got a perfect collection for Plex / Emby / Jellyfish to start streaming your media. Really awesome suite once you get it up and running.