Update: The Seventh Round of the BitTorrent Airdrop will occur on 11 August 2019.
Learn everything about BitTorrent Airdrop mechanics, reasons, and timeline on this BitTorrent Airdrop blog.
BitTorrent is a pioneering distributed communication protocol designed by Bram Cohen on 2 July 2001. It is a peer-to-peer protocol which uses economic incentives to facilitate the delivery of a large and highly demanded data and electronic files over the internet, eliminating the need for a trusted central server. It is an open protocol that has been independently implemented dozens of times and included in the software that has been downloaded and installed billions of times in the past 16 years.
More about the history of BitTorrent can be read in this article: From P2P file sharing to IEO.