$BTC Bitcoin (BTC) is the world’s first and most popular cryptocurrency, created in 2009 by an unknown person or group using the name Satoshi Nakamoto. It is a decentralized digital currency that allows people to send and receive money over the internet without relying on banks or any central authority. Bitcoin uses blockchain technology to keep transactions secure and transparent. With a limited supply of 21 million coins, it is often referred to as "digital gold" and is widely used for both investment and payments across the globe.