BitTorrent is a peer-to-peer file sharing protocol used for distributing large amounts of data. BitTorrent is one of the most common protocols for transferring large files, and it has been estimated that it accounted for roughly 27–55% of all Internet traffic (depending on geographical location) as of February 2009
The Pirate Bay (commonly abbreviated TPB) is a Swedish website that indexes BitTorrent (.torrent) files. It bills itself as "The world's most resilient bittorrent site" and is ranked as the 91st most popular website in the world and 19th in Sweden by Alexa Internet since 2008. The website is primarily funded with advertisements shown next to torrent listings. Initially established in November 2003 by the Swedish anti-copyright organization Piratbyrån (The Piracy Bureau) the website has been run as a separate organization since October 2004. The website used to be run by Gottfrid Svartholm and Fredrik Neij who are known as anakata and TiAMO, respectively. They have both been charged with "assisting in making copyrighted content available" due to their involvement in The Pirate Bay.
Demonoid is a website and BitTorrent tracker created by an anonymous Serbian known only by the pseudonym "Deimos" and "Zajson". The website indexes torrents uploaded by its members. It is the second largest, and is the most popular, public tracker, and is ranked the 403rd most popular website overall in December 2008, according to Alexa. Demonoid's torrent tracker had an estimated 3 million peers in September 2007. The site had over 252,427 torrents indexed as of May 3, 2009 (torrents uploaded prior to August 4, 2005 were removed to free server
Though The Pirate Bay would be my first port [sic] of call.