$BTC Bitcoin (BTC) is the first and largest decentralized cryptocurrency, created in 2009 by a pseudonymous entity known as Satoshi Nakamoto. It operates on a distributed ledger technology called blockchain, which ensures the security and immutability of transactions without the need for intermediaries like banks.

Its supply is limited to 21 million units, giving it a deflationary nature. BTC transactions are recorded in blocks that are added to the chain, being verified by a global network of computers (miners). Mining also releases new bitcoins as a reward.

BTC has gained popularity as "digital gold" and a store of value asset, although its volatility is notable. It is used for payments, investments, and as a hedge against inflation in some cases. Its impact on global finance continues to grow, challenging traditional monetary systems.