$BTC Bitcoin is a decentralized digital currency, created in 2009 by an unknown person or group using the pseudonym Satoshi Nakamoto. It operates without a central bank or single administrator, using peer-to-peer technology on a public, distributed ledger called the blockchain. Transactions are verified by network nodes through cryptography and recorded on the blockchain, ensuring transparency and immutability.

Bitcoin's supply is capped at 21 million coins, making it a deflationary asset. It can be used for online and in-person transactions where accepted, and it's also popular as an investment. The value of Bitcoin has experienced significant volatility since its inception, driven by factors like supply and demand, adoption rates, regulatory news, and market sentiment.