BitTorrent

BitTorrent (often abbreviated as BT) is a highly efficient, decentralized peer-to-peer (P2P) communication protocol for file sharing, designed by Bram Cohen in 2001. It is primarily used for distributing large files (e.g., operating system ISOs, HD movies, large software, and games). Its core philosophy is "to share is to gain"—the more users downloading the same file, the faster the download speed tends to be for everyone.