Bitcoin (BTC) is a decentralized digital currency that was introduced in 2009 by an anonymous person or group known as Satoshi Nakamoto. It operates without a central authority or government, relying instead on a peer-to-peer network and blockchain technology to verify transactions and maintain transparency. Bitcoin is limited in supply, with a maximum of 21 million coins, which contributes to its appeal as a store of value. It can be used for transactions, investment, and as a hedge against inflation. Over time, Bitcoin has gained widespread adoption, influencing the development of other cryptocurrencies and transforming the financial landscape.