Foreign exchange involves the trading of one country's currency for another. It occurs in the foreign exchange market, one of the largest financial markets globally. Exchange rates represent the value of one currency relative to another, with different factors like economic performance, interest rates, and central bank actions affecting fluctuations. Currency derivatives provide benefits like price transparency, risk management, and access to global trading for various participants in foreign exchange markets like importers/exporters, hedgers, speculators, and arbitrageurs.