Crypto currency is a virtual currency which is used insted of real money. It can be in a game or be equal to the value of your local currency like dollars,euro's ,PkR, e.t.c.Most popular coins are Dogecoins,litecoins and finally Bitcoins. Bitcoin is popular among them all. The crptocoin is the future you can earn any virtual currency by doing Facuets,Freelancing or any other task's. Now a days you can also shop with these types of currency this makes it more secure to the buyer for instering their finance information. The risk is now reduced thank's to these currencies. Many people earn coins by mining.