The BitTorrent protocol is used for peer to peer file sharing and it's an extremely efficient way of downloading and sharing files with groups of people. While file sharing with BitTorrent is normally associated with video files like movies or TV episodes, it's also common for Linux developers to offer a torrent download of their distribution.
This is a companion discussion topic for the original entry at https://linuxconfig.org/ubuntu-20-04-list-of-torrent-clients