When the amount of Turkish lira decreases to buy 1 US dollar, the total amount you should pay also decreases and foreign goods are cheaper. In other words, domestic currency gains value and it is known as the appreciation of the domestic currency. Under the assumption, however, when the amount of Turkish lira increases to buy 1 US dollar, the total amount you should pay also increases and foreign goods are expensive. In other words, domestic currency loses its value against the dollar and it is known as the depreciation of domestic currency.