Bitcoin $BTC is the original decentralized digital currency, created in 2009 by the pseudonymous Satoshi Nakamoto. Operating on a peer-to-peer blockchain network, Bitcoin enables secure, borderless transactions without relying on banks or central authorities. With a fixed supply capped at 21 million coins, BTC is often called "digital gold" for its scarcity and role as a store of value. Widely traded on exchanges worldwide, Bitcoin remains the largest cryptocurrency by market capitalization and continues to shape the future of decentralized finance.