BitTorrent is a protocol that enables fast downloading of large files using minimum Internet bandwidth. It costs nothing to use and includes no spyware or pop-up advertising.BitTorrent is one of the most common protocols for transferring large files, and it has been estimated that it accounted for roughly 27% to 55%of all Internet traffic (depending on geographical location) as of 2009. As of February 2013, BitTorrent was responsible for 3.35% of all worldwide bandwidth, more than half of the 6% of total bandwidth dedicated to file sharing. Unlike other download methods, BitTorrent maximizes transfer speed by gathering pieces of the file you want and downloading these pieces simultaneously from people who already have them. This process makes popular and very large files, such as videos and television programs,download much faster than is possible with other protocols.