$BTC Bitcoin ($BTC) is the first and most well-known cryptocurrency, launched in 2009 by an anonymous person or group under the name Satoshi Nakamoto. It operates on a decentralized, peer-to-peer blockchain network without the need for a central authority. Bitcoin is often viewed as digital gold due to its limited supply of 21 million coins and is used for investment, payments, and as a hedge against inflation. Its price is highly volatile, influenced by market demand, macroeconomic factors, and regulatory news. While praised for its innovation and security, Bitcoin also faces criticism over energy consumption and use in illicit transactions.