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A cryptocurrency is a digital or virtual currency that is secured by cryptography, which makes it nearly impossible to counterfeit or double-spend. Cryptocurrencies typically operate on decentralized networks based on blockchain technology, a distributed ledger that records and validates transactions across multiple nodes. Cryptocurrencies can be used for various purposes, such as online payments, remittances, peer-to-peer lending, crowdfunding, and more. Some of the most popular cryptocurrencies include Bitcoin, Ethereum, Litecoin, and Dogecoin.