Bitcoin is a digital currency that runs on blockchain network controlled by the people.
Real money is currency issued and controlled by the banks and government with no privacy whatsoever.
That is the reason Bitcoin made a lot of the developers and the rich interested it. They like to using a currency can provide them all privacy, permission. They do not need to depend on the government and scare the government pay attention in their amount.
Fiat money is manipulated by the banks and governments that's why it will cost you some taxes. Also the Bitcoin is a digital currency which makes the p2p deals more easier and fast. Also Bitcoin has a lot of advantage compared to he physical money. The less labor, endurance, accuracy and the time.