$BTC Bitcoin (BTC) is a digital currency that was introduced in 2009 by an unknown person or group using the pseudonym Satoshi Nakamoto. This cryptocurrency is based on blockchain technology, which ensures the security and transparency of transactions. Bitcoin is not subject to the control of any central bank or government, making it popular worldwide. People use it for online purchases, investments, and payments in some places. Its price is subject to fluctuations according to supply and demand in the market.