BitTorrent is a powerful peer-to-peer (P2P) file-sharing protocol designed for the high-speed distribution of large amounts of data. Unlike traditional downloads where you get a file from a single central server, BitTorrent allows you to download small pieces of a file from multiple users simultaneously. How to Download and Install BitTorrent
For newer macOS versions (Catalina 10.15 and later), only is officially supported.
While the official BitTorrent client is popular, many users prefer open-source or lightweight alternatives that are free of advertisements. BitTorrent: The Engineering behind the BitTorrent protocol