How do exchange rate changes alter trade so that the trade balance actually improves when the domestic

Question:

How do exchange rate changes alter trade so that the trade balance actually improves when the domestic currency depreciates?

Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...