Bitcoin is a digital currency created in 2009 that allows for anonymous transactions without third parties like banks. It can be used to buy goods and services from some merchants. Bitcoins are acquired by buying them on exchanges using real currencies or "mining" them by solving complex math puzzles. They are stored in digital wallets and can be used to make anonymous international payments easily and cheaply. Some see it as a new investment opportunity, while its anonymity also enables illicit buying and selling online.