Wang is very "buying". He went to the bank to buy "dollars" and changed RMB into dollars. Dollars belong to foreign exchange. When buying, he will exchange it with the buying exchange rate.

The types of exchange rates are: 1. According to whether the exchange rate is suitable for different sources and purposes, it can be divided into single exchange rate and multiple exchange rates or multiple exchange rates. 2. From the perspective of buying and selling foreign exchange by banks, it can be divided into buying exchange rate, selling exchange rate and intermediate exchange rate. According to the evolution of the international monetary system, it can be divided into fixed exchange rate and floating exchange rate.