Bitcoin (BTC) is a decentralized digital currency that was created in 2009 by an unknown person or group using the pseudonym Satoshi Nakamoto. It operates on a peer-to-peer network, allowing users to send and receive payments without intermediaries like banks. Transactions are recorded on a public ledger called the blockchain, which ensures transparency and security. Bitcoin is limited to 21 million coins, which adds to its scarcity and value. Its price is highly volatile, influenced by market demand, regulatory news, and institutional adoption. As a leading cryptocurrency, Bitcoin has spurred the development of thousands of altcoins and has become a significant part of the financial landscape.