Currency pair is the exchange rate of two foreign currencies, EURUSD, which means euro against dollar. The way to make a profit is to buy low and sell high, buy the target foreign exchange at a low price, and then sell it at a high price.

Personal foreign exchange trading is a foreign exchange financial product. Many banks have this kind of business. You can do business by telephone or online banking.

The bank shows two prices, the buying price and the selling price. The former is the bank's buying price and the latter is the bank's selling price.

For example, EURUSD, the euro trades against the dollar. Suppose the bank's buying price is 1.2 1 10, and the bank's selling price is 1.2 140. That is to say, if the customer wants to buy euros, the bank's selling price is 1.2 140. The bank's bid price 1.2 1 10, and the customer's loss is 0.0030, so the customer has to wait for the euro to rise, and can only sell it when the bank's bid price (customer's selling price) rises above 1.2 140. The price difference in the middle is the exchange gain and loss of the bank, that is, the foreign exchange transaction fee.