In the old age,few centuries ago people uses some money system which is called Barter system to buy and sell their products.This system works like exchanging their products between two people when they are in need but they realized that that system has flaws and not suitable for everyone since if there is no demand for one's product he can't buy anything he needs so later they moved to currencies (paper money) until now people uses this as their main form of payment but in digital format but people needs to understand that this also has flaw of centralization so we need to move to the decentralized money for better life.Lets get update ourselves to use the crypto currencies.
The paper money have its advantages as well as disadvantages as the advantage being that the person can transact whenever he want and wherever he want but the demerit of paper money is that carrying huge amounts of money is not possible for single person and is a lot risky. Now comparing crypto it is the best and it's having many more advantages over paper money and only demerit being only one that the people need a phone and active internet connection for transacting.