Real-time exchange rate refers to the real-time transaction price in the current foreign exchange market, which reflects the changes in the current market supply and demand relationship and the real-time information of the foreign exchange market. Spot exchange rate refers to the price of buying and selling foreign exchange in spot transactions, that is, the transaction price for settlement now, usually the real-time exchange rate in the current market. In addition to spot exchange rate, there are forward exchange rate and middle price. Forward exchange rate refers to the future transaction price, which is usually provided by banks and foreign exchange dealers. The central parity exchange rate is generally announced by the central bank, which is the average of the spot foreign exchange buying price and selling price, and is usually used as the reference exchange rate in the foreign exchange market. Different types of exchange rates have corresponding uses and importance in different situations.