The first category is game coins that have nothing to do with the real economy. It is a one-way currency that can only be used in virtual games.

The second category is the special currency issued by enterprises that can be purchased with real money, which can only be used to purchase designated services or commodities and cannot be exchanged for real money and silver;

The third category is electronic money generated by open source algorithms, which can be exchanged with official money in a certain proportion, such as bitcoin.

Digital currency is sought after because it relies on technology to achieve decentralization, which has certain concealment and anonymity. However, because digital currency is widely accepted and used, it will have a great impact on social and financial stability, because digital currency cannot be effectively supervised, which will weaken the effectiveness of policies.