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# What is a cryptocurrency?

Cryptocurrency is a medium of exchange, usually decentralized, that uses <mark style="color:yellow;">**blockchain**</mark> technology and cryptography to ensure the validity of transactions and the creation of new units of currency.

Basically a cryptocurrency is a kind of money, but with the difference of being completely digital. In addition, it is not issued by any government (as is the case with the real or the dollar, for example).