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Cryptocurrency is a type of digital or virtual currency that uses cryptography for security. It operates on decentralized networks based on blockchain technology, a distributed ledger that records all transactions across a network of computers. Bitcoin, created in 2009, was the first decentralized cryptocurrency, and since then, many others have emerged, including Ethereum, Ripple, and Litecoin. Cryptocurrencies can be used for various purposes, such as online transactions, investment, and as a means of transferring assets globally. The market for cryptocurrencies can be highly volatile, and their adoption continues to evolve.