$BTC Bitcoin ($BTC) is the first and most well-known cryptocurrency, created in 2009 by a person or group using the pseudonym Satoshi Nakamoto. It operates on a decentralized network called blockchain, which securely and transparently records all transactions without the need for intermediaries like banks. Its supply is limited to 21 million units, making it a scarce asset. Bitcoin is used as a store of value, medium of exchange, and speculative asset. Its price is highly volatile, influenced by market demand, global news, regulation, and institutional adoption. It is considered the digital gold of the 21st century.