A decentralized digital currency that operates on a peer-to-peer network without the need for intermediaries like banks. It was created by an unknown person or group of people using the pseudonym Satoshi Nakamoto and was released as open-source software in 2009. Transactions are verified by network nodes through cryptography and recorded on a public ledger called a blockchain. Bitcoin can be used for online purchases, investments, and as a means of transferring value globally. Its limited supply of 21 million coins contributes to its value and deflationary nature.