Bitcoin is really a true currency/money. Why? because once you have it you can convert into a real money according to country you belong. And the banks also accepting bitcoin whether you are in different places of the world. In that case it shows how bitcoin is very popular in online business.
I guess bitcoin is money that you can use in online market. Some online market or market accept bitcoin as payment of their costumer so I think bitcoin is money that you can buy anything.Lastly,Bitcoin is digital money that you can use in different transaction in online.