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.
When you buy, sell, or trade crypto, those transactions are recorded on a decentralized ledger called blockchain, which is a permanent, unchangeable record. Any changes to a blockchain must be approved by a majority of users, which also makes it a highly secure form of record keeping.