Bitcoin is a decentralized digital currency created in 2009 by an anonymous person or group known as Satoshi Nakamoto. It operates on a peer-to-peer network and uses blockchain technology to maintain a secure, public ledger of transactions. Unlike traditional currencies issued by governments, Bitcoin is not controlled by any central authority, which is part of its appeal. Transactions are verified by network nodes through cryptography and recorded in the blockchain, making it resistant to fraud and double-spending. Bitcoin can be used for various purposes, including investments, purchases, and as a store of value, but its value can be highly volatile.