BitTorrent is popular peer-to-peer sharing communication protocol used for transferring all kind of files over the Internet. Two of the most popular BitTorrent clients for Linux are Azureus and KTorrent. If you're looking for a robust, fast, simple, and powerful BitTorrent client, you will probably go with KTorrent. If you want a Java-based client that runs on every platform and allows you to configure every detail for BitTorrent transfer, consider Azureus.