Cryptocurrency is a completely digital, decentralized form of currency. It can be used as a means of payment or exchange (though that’s not a very practical use today), or as a potential store of value. Since it’s a digital currency, you can’t carry Bitcoins around physically in bill or coin form; all transactions take place online. Cryptocurrency is also decentralized, meaning it’s not backed by government authority the way the U.S. dollar, for example, is. Instead, it’s maintained by its users.