BitTorrent

BitTorrent is a protocol that supports the practice of peer-to-peer file sharing and is used for distributing large amounts of data over the Internet. BitTorrent is one of the most common protocols for transferring large files and peer-to-peer networks have been estimated to collectively account for approximately 43% to 70% of all Internet traffic (depending on geographical location) as of February 2009. In November of 2004 BitTorrent was responsible for 35% of all Internet traffic.