A core aspect of the BitTorrent file distribution system is torrent files. These are computer files which contain information, or metadata, about files to be distributed. Torrent files also usually contain network locations of BitTorrent Trackers which, as previously described, helps peers find each other. Torrent files does not contain any content, only the information about those files.
Trackers also help to create swarms, which are efficient distribution groups. Rather than using a single server to download a file, BitTorrent lets users form a ‘swarm’ of hosts to upload or download from each other simultaneously. This is just one reason why BitTorrent reduces the server and network impact of sharing large files.
The BitTorrent protocol was designed in April 2001 by student programmer Bram Cohen.
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