$BTC Bitcoin (BTC) is a decentralized digital currency that allows peer-to-peer transactions without the need for intermediaries like banks. Created in 2009 by an unknown person or group using the name Satoshi Nakamoto, Bitcoin operates on a blockchain, a public ledger that records all transactions. It uses cryptographic techniques to secure transactions and control the creation of new units. Bitcoin is limited to 21 million coins, making it scarce and often compared to digital gold. It is used for investment, online purchases, and as a hedge against inflation. Bitcoin's price is highly volatile and influenced by demand, regulation, and global events.