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Bitcoin is a decentralized digital currency that uses cryptography for security and is not controlled by any central authority or institution. It was created in 2009 by an unknown person or group using the pseudonym “Satoshi Nakamoto,” and it has since become the most widely-used and well-known cryptocurrency.

Bitcoin is based on a technology called blockchain, which is a decentralized, distributed ledger that allows for the secure and transparent storage and transfer of data and value. Bitcoin uses this technology to allow for the peer-to-peer transfer of value, without the need for intermediaries such as banks or other financial institutions.

Bitcoin can be bought, sold, and traded on cryptocurrency exchanges, and it can be used to purchase goods and services from merchants who accept it as payment. It is also used as an investment by many individuals and institutions, who hold it as part of their overall investment portfolios.