Digital currency refers to a currency that is connected to the Internet, meaning, more simply, any currency that can be transferred to a computer or mobile via the Internet. For example- we use debit card / credit card, ATM booths.
That is, the digital currency has both physical and digital aspects.
Cryptocurrency
Crypto money is invisible, and adding currency to it is cryptocurrency. In other words, invisible economic management is called cryptocurrency. Simply put, it is a currency that has no physical condition. It resides in a blockchain database system. Such as Bitcoin, BNB, Etherium, etc. I don't think there is much to be said about cryptocurrency here because everyone who is there knows about cryptocurrency.
From here, I have made this post as clear as I can
I think those definitions are totally wrong.
First, debit card is not a digital currency. This is just a payment method. You can use many different currencies using a debit/credit card, you can even buy things with one currency and pay with another one using a debit/credit card.
Second, there are cryptocurrencies that do no use blockchain technology. For example, XRP and IOTA.