Cryptocurrency is a digital or virtual currency that uses cryptography for security and operates independently of a central bank. It is a decentralized form of currency, meaning that it is not controlled by any single institution or government. 

Cryptocurrencies are based on a distributed ledger technology called the blockchain, which allows for secure and transparent tracking of transactions. 

Many cryptocurrencies, such as bitcoin, are based on a proof-of-work and proof-of-stake system, which rewards participants who contribute computing power to the network with the issuance of new units of the currency. 

Cryptocurrencies are becoming increasingly popular due to their potential for high returns on investment and their ability to provide a secure and decentralized means of conducting transactions.

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