When an exchange rate changes, the value of one currency will go up while the value of the other currency will go down. When the value of a currency increases, it is said to have appreciated. On the other hand, when the value of a currency decreases, it is said to have depreciated.
Currencies are traded in the foreign exchange market. Like any other market, when something is exchanged there is a price. In the foreign exchange market, a currency is being bought and sold, and the price of that currency is given in some other currency. That price is expressed as an exchange rate.
The exchange rate of a currency is how much of one currency can be bought for each unit of another currency. A currency appreciates if it takes more of another currency to buy it, and depreciates if it takes less of another currency to buy it.
when the exchange rates of currencies are determined in free markets by the interaction of supply and demand Currencies are traded in the foreign exchange market. Like any other market, when something is exchanged there is a price.