BTC is the ticker symbol for Bitcoin, the first and largest cryptocurrency by market capitalization, created in 2009 by the pseudonymous Satoshi Nakamoto.

Bitcoin operates on a decentralized peer-to-peer network using blockchain technology. It has a fixed supply cap of 21 million coins, with new bitcoins created through mining. Bitcoin is often called 'digital gold' and is used as both a store of value and medium of exchange.