Bitcoin is known as digital currency,sometimes people say digital asset. Talking about btc as digital currency, there is no central bank behind it as supporting institution. No centralized regulator that is fully responsible. It works with decentralized system using blockchain technology. Btc can be converted to local currency and also can be used as payment method but in several countries don' t accept it. While in real money, what we have is the opposite of them.
Yes several countries not accepting bitcoin. But as with time the popularity of bitcoin grows they will start bitcoin as a payment system. The main difference between bitcoin and real money is bitcoin is digital crypto currency and real money is virtual and traditional currency which is used as a payment system and exchange of good and services.