Dig­i­tal mon­ey gen­er­al­ly rep­re­sents fiat cur­ren­cies, such as dol­lars or euros. It is exchanged using com­put­ers, smart­phones, cards, and online cryp­tocur­ren­cy exchanges. In some cas­es, it can be con­vert­ed into phys­i­cal cash using an ATM.