Bitcoin is a decentralized digital currency that is produced and held electronically through a network of computers solving mathematical problems, rather than being printed by a central authority. Initially proposed by Satoshi Nakamoto, Bitcoin operates on a fixed supply of 21 million coins and is characterized by low transaction fees, fast payments, and a degree of anonymity alongside a transparent ledger system called the blockchain. Its features include ease of setup, transparency, and non-repudiation, making it distinct from traditional currencies.