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Cryptocurrencies are digital or virtual currencies that use cryptographic technology to secure and verify transactions. They do not have a physical equivalent, such as paper money or coins. Instead, they are stored electronically in special wallets and can be transferred or exchanged anywhere in the world where there is access to the internet. Cryptocurrencies use blockchain technology, which provides transaction security and protection against fraud. This makes cryptocurrencies very attractive to many people and companies who want to send and receive money quickly and securely.