unionpay/visa/master/JCB/American express are all credit card organizations, and the logo on the card represents that it can be used in its network/channel.

At present, RMB consumption in China only allows UnionPay channel, and bank cards issued in China must belong to UnionPay network at the same time. Some bank cards may not have the UnionPay logo due to cooperation and other restrictions, but they can still be used through the UnionPay network.

The network of UnionPay abroad is not developed, so there are dual-currency cards. That is to say, China uses UnionPay to consume RMB, while foreign countries use channels such as Visa/Master to consume foreign currency. In a sense, this is a last resort for UnionPay.

One currency is RMB, the other is usually USD, and it can also be Euro, Japanese Yen, Hong Kong Dollar, etc.

if the foreign currency is inconsistent through the network such as Visa/Master, such as the USD/RMB dual-currency card spending Euro, there will be additional foreign exchange fees.

Now, foreign UnionPay has also established a certain network. Some merchants in Hong Kong, South Korea, Japan, Southeast Asia, Europe and other countries can directly use the UnionPay network to directly consume RMB (automatic exchange rate conversion) without any exchange fee.

in addition, cards with unionpay logo can also be consumed on the Discovery network (north America and central America).

if only unionpay is indicated on the credit card, and the card number starts with 62, it is a standard unionpay card, which can only be used for domestic ATM/POS consumption and withdrawal, or through the network/channel of foreign unionpay and cooperative institutions (Citigroup /Discovery, etc.), which basically has great restrictions.

The management organization of dual-currency cards is usually not UnionPay, but another symbol besides UnionPay, and the main part of the annual fee is paid to organizations such as Visa/Master/JCB. It is foreseeable that the issuance of dual-currency cards will be less and less.

But it can't be said that it's not good. Vista/Master's network/channel consumption (including online consumption) does not need a password, and if it is lost, it is likely to be stolen. It is only the UnionPay standard card, which can hardly be consumed online. It can also be said that it is more secure.