BitTorrent is a peer-to-peer file sharing (P2P) communications protocol; it is a method of distributing large amounts of data widely without the original distributor incurring the entire costs of hardware, hosting and bandwidth resources.
Bram Cohen, he designed it in April 2001, it’s now maintained by Cohen’s company BitTorrent, Inc.
BitTorrent is different from Http and ftp that are only speaking to the server and never communicate to each other. Another method of transferring files has become popular, which is most closed to BitTorrent is Peer-to-peer as Mandy’s blog has mentioned this topic, it direct connect one to one, it is good for files can shared without having access to a proper server, but little accountability for the contents of the files. A newest version of some clients allow downloading a single file from multiple sources for higher speeds, but popular download is somewhat mitigated, because the great chance that a popular file will be offered by a number of peer.
BitTorrent is also supports stopping and later resuming a partial download. Torrent is a metadata, it means that the file contains information about the data that you want to download, but it is not the data itself. Peer, which is another computer that you connect to and transfer data, generally a peer does not have the completely file. Seed, it is the most important character in BitTorrent, it has a completely copy of a certain torrent. Generally BitTorrent requires good manners to continue seeding a file after you have finish downloading, and it will help others. Reseed means zero seeds for a given torrent, all the peers will et stuck with an incomplete file, now it require a seed co connect to the swarm so others can transferred missing pieces. Swarm, it is a group of machine that are collectively connected for a particular file, eg 3 seeds, 10 peers so swarm consists you and other 13 people.

Flash pic from Wiki Site.
Bittorrent allow people to download or share music online, once cusomters get familiar with the songs that they like they may purchase the physical one or online digital one in a perfect condition, not the compress one.
A song give explanation how useful it is BitTorrent!
Bibilography
What is BitTorrent
http://www.dessent.net/btfaq/#what
http://en.wikipedia.org/wiki/BitTorrent
BitTorrent Song
http://www.youtube.com/watch?v=vN1D5jJAHTs view at 22th October 2007

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