1, USD: The USD is the official currency of the United States and the most important reserve currency in the world.

2. Euro: The euro is the official currency of the European Union and is used by 19 member countries.

3. Renminbi: Renminbi is the official currency of China and one of the largest foreign exchange reserve currencies in the world.

4. Japanese yen: The Japanese yen is the official currency of Japan and is also widely used in international trade and foreign exchange markets.