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What Does Interest Have to Do with Currencies?

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The large differences in interest rates led to the emergence of the carry trade, an interest rate arbitrage strategy that takes advantage of the interest rate differentials between two major economies, while aiming to benefit from the general direction or trend of the currency pair. This trade involves buying one currency and funding it with another, and the most commonly used currencies to fund carry trades are the Japanese yen and the Swiss franc because of their countries' exceptionally low interest rates. The popularity of the carry trade is one of the main reasons for the strength seen in pairs such as the Australian dollar and the Japanese yen (AUD/JPY), the Australian dollar and the U.S. dollar (AUD/USD), the New Zealand dollar and the U.S. dollar (NZD/USD), and the U.S. dollar and the Canadian dollar (USD/CAD).
Source: http://www.investopedia.com/articles/forex/05/041305.asp