Money is unreal, meaning imaginary, intangible - a concept.
Currency is NOT money, but merely represents money.
So, bitcoin is... ?
LoL. Let's say that Bitcoin is a global currency or a monetary system of some sorts working on a global scale. It is not like a singular currency. Rather it can be converted into national currencies. This makes it an effective way of payment during holidays. It can easily be converted into the local currency.