A lot of people confuse digital currency with crypto currency. While all crypto currencies are digital currencies, not all digital currencies are cryptocurrencies.
Fiat money can be sent digitally or transact digitally. For instance you can use card payment or mobile payment wallet, or QR Code payment. None of these transactions use physical money, you use virtual money (or digital money for transaction).
Crypto currencies on the other hand do not have any physical existence, they are created digitally, transact digitally, and exist only in the internet. Cryptocurrencies are called cryptocurrencies because they utilize cryptography to anchor their exchanges.
In recent time, Central Banks in various countries are also trying to create their own Digital Currency and they are calling it Central Bank Digital Currency. China has been using CBDC since some time.