Bitcoin is a digital currency created in 2009 by an unknown person using the name Satoshi Nakamoto. Bitcoins exist on a peer-to-peer network, have no central authority, and transactions are made without middlemen like banks. Users can buy and sell bitcoins anonymously online or acquire them by "mining" through solving complex math problems. While bitcoins offer anonymity and lack of fees, their future is uncertain as governments are concerned about regulating the unregulated currency.