The euro against the dollar is not a currency, but the euro against the dollar refers to the exchange rate of the euro against the dollar in foreign exchange. Eur is the abbreviation of euro, and usd is the abbreviation of dollar. Exchange rate, also known as foreign exchange rate, foreign exchange rate or foreign exchange market, refers to the exchange rate between two currencies, and can also be regarded as the value of one country's currency against another's currency. Specifically, it refers to the ratio or parity between one country's currency and another country's currency, or the price of another country's currency expressed in one country's currency.

Exchange rate changes have a direct regulatory effect on a country's import and export trade. Under certain conditions, the devaluation of the local currency, that is, lowering the exchange rate, will promote exports and restrict imports; On the other hand, the appreciation of the local currency, that is, the rise of the exchange rate, plays a role in restricting exports and increasing imports.

Exchange rate type:

1. According to the evolution of the international monetary system, there are fixed exchange rates and floating exchange rates.

2. According to the method of setting exchange rate, there are basic exchange rate and arbitrage exchange rate.

3. According to the angle of buying and selling foreign exchange, there are buying exchange rate, selling exchange rate, intermediate exchange rate and cash exchange rate.

4. According to the bank's foreign exchange payment methods, there are wire transfer exchange rate, letter exchange rate and bill exchange rate.

5. According to the delivery period of foreign exchange transactions, there are spot exchange rates and forward exchange rates.

6. According to the severity of foreign exchange management, there are official exchange rates and market exchange rates.

7. According to the bank's business hours, there are opening exchange rates and closing exchange rates.