$BTC is a decentralized cryptocurrency created in 2009 by an anonymous entity known as Satoshi Nakamoto. It operates on a technology called blockchain, a public and immutable ledger that records all transactions. Unlike traditional currencies, Bitcoin is not controlled by any government or financial institution, giving it a censorship-resistant nature. Its value is determined by supply and demand, and it can be used for payments, investments, or as a digital store of value.