$BTC Bitcoin (BTC) is a decentralized digital currency, created in 2009 by an unknown person or group using the pseudonym Satoshi Nakamoto. It operates without a central authority like a bank, using peer-to-peer technology on a public ledger called the blockchain. Transactions are verified by network nodes through cryptography and recorded on the blockchain, making it secure and transparent.

Bitcoin's supply is capped at 21 million coins, making it a deflationary asset. It can be used for online and some in-person transactions where accepted, and it's also popular as an investment. Bitcoin's value can be volatile due to market demand, supply, and other factors.