this information is already best explained in installation guide
BitTorrent
BitTorrent is a method of downloading large files that takes advantage of peer-to-peer file sharing techniques. Normally, a single server or small group of servers are all that provide the bandwidth for anyone who downloads a particular file. BitTorrent distributes the load among the various BitTorrent users who are downloading the file. It does this by allowing downloaders to download bits of the file from the other users who already have those bits.
If you are already running Linux, BSD, Solaris or Mac OS X then visit:
http://www.transmissionbt.com/download.php
to get Transmission, a BitTorrent client which is the default in Fedora.
If you are currently using Windows, visit:
http://deluge-torrent.org/downloads.php
Then download Fedora using BitTorrent at:
http://torrent.fedoraproject.org/
Visit [1] for other download options