$BTC Bitcoin (BTC) is the world’s first and most famous cryptocurrency, created in 2009 by an unknown person or group using the name Satoshi Nakamoto. Bitcoin allows people to send and receive money over the internet without using banks. It uses blockchain technology, a public record of all transactions, to keep the system secure and transparent. Bitcoin has a limited supply of 21 million coins, making it scarce like gold. Many people see Bitcoin as a store of value and a hedge against inflation. It is also used for payments, though its price can change quickly, making it very volatile.