An exchange rate tells you how much one country's currency is worth in terms of another country's currency. In other words, it's the price of one currency in terms of another. For example, if the exchange rate is 1.25 Euros for 1 US Dollar, it means 1.25 Euros can be exchanged for 1 US Dollar and that 1 US Dollar can be exchanged for 1.25 Euros.
Many people follow exchange rates very closely because they change over time. This means that the cost of doing business with another country can fluctuate over time.
When comparing two currencies, any relative change in value means that one currency got stronger and the other got weaker.
Often we'll say things like the exchange rate is $1.25 Euros per dollar. But that's kind of wordy. It's often easier to just give the number, followed by the word direct or indirect.
You've been briefed with the following facts:
The direct exchange rate is 0.6485.
The foreign currency is the won.
You have 52.37 yen.
You typically use the yen.