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They usually use the .torrent protocol readable by bit torrent programs. While torrents are used a lot for piracy it can also be used to download legitimate programs called shareware. A lot using bit torrent and filesharing services because it may be cheaper and faster than having people download the whole file from your website.

The piracy of music and movies is often evident on file-sharing services that use the BitTorrent protocol (BT). The BitTorrent  is a communication protocol for peer-to-peer file sharing (P2P). Users connect to each other directly to send and receive portions of the file. The coordination between the actions of all such peers is made by a central server, called  tracker.