The difference between a digital currency and a cryptocurrency is that the latter is decentralised, meaning it is not issued or backed by a central authority such as a central bank or government. Instead, cryptocurrencies run across a network of computers. Digital currencies have all the characteristics of traditional currencies but exist only in the digital world. They are issued by a central authority.
It's working: in just the past few months, we took down 1.7 billion fake accounts to stop bad actors from doing harm.

Altcoins also sometimes differ in the method of verification used to authenticate transactions. While some altcoins use Proof-of-Work systems, others use Proof-of-Stake consensus, which replaces miners with validators. Proof-Of-Stake mining requires a lot less energy and fewer resources than Proof-Of-Work systems since Proof-Of-Work miners have to do much more ‘work’ to mine blocks.
Binance.US has an option to automatically buy and sell crypto using U.S. dollars, using a simple interface that’s similar to what you’ll find on Coinbase and other competitors. Each of these buy/sell transactions charge a 0.5% fee.