Currency exchange refers to the process of converting one currency into another. This is typically done when traveling to a different country, where the local currency may be used instead of one's own. Currency exchange can also involve trading currencies for speculative purposes or as part of an investment strategy. In this case, individuals or institutions will buy and sell various currencies in hopes of making a profit based on fluctuations in their values. Overall, currency exchange is the process by which one type of money is converted into another, either for personal use while traveling or as part of an investment strategy.