It’s not a typical currency in terms of Great Britain’s Pound Sterling or the United States Dollar, it’s not got a physical form and nor does it act as an official currency of any state around the world.
It’s based around data online, and you have to mine data in order to find these coins. Despite it being nothing more than a bit of digital code though, it can be extremely valuable. But what are the best ones to look out for and invest in? Well, let’s take a look. 
Source: https://www.entrepreneurshipsecret.com/best-cryptocurrencies-to-invest-in/