$BTC Bitcoin ($BTC) is the first and most well-known cryptocurrency, created in 2009 by Satoshi Nakamoto. It operates on a decentralized network based on blockchain, ensuring secure and transparent transactions without intermediaries. Its supply is limited to 21 million coins, which contributes to its appreciation. It is used as a store of value, a means of payment, and a speculative investment. Despite volatility, it attracts global interest, with increasing adoption by companies and institutional investors. Factors such as halving, regulations, and market sentiment influence its price. Criticisms include energy consumption and use in illicit activities, but its innovation continues to revolutionize the financial system.