Bitcoin (BTC) is the first and most well-known cryptocurrency, launched in 2009 by the pseudonymous Satoshi Nakamoto. It operates on a decentralized, peer-to-peer network using blockchain technology, which ensures transparency, security, and immutability of transactions. Bitcoin is limited to a supply of 21 million coins, making it a deflationary asset. It enables borderless transactions without intermediaries like banks, with relatively low fees. Bitcoin is secured by a proof-of-work consensus mechanism, where miners validate transactions. Often referred to as "digital gold," it is widely used as a store of value, investment asset, and medium of exchange in the crypto economy.