$BTC
Bitcoin is essentially digital money. It is the first cryptocurrency ever created, announced in 2008 (and launched in 2009). Bitcoin allows users to send and receive digital money called bitcoins (with a lowercase b, or BTC for short).
Unlike traditional fiat currencies issued by governments (like dollars or euros), Bitcoin is decentralized, meaning no single institution, government, or entity controls it. Transactions are conducted peer-to-peer, removing the need for banks or financial institutions to act as intermediaries.