Why do central banks hold foreign currency reserves?

Central banks hold foreign currency reserves for several practical reasons. First, they stabilize their own currency's value by buying or selling reserves during market volatility. Second, they enable international trade by having currencies other nations accept. Third, reserves provide a safety net during financial crises—when a country faces economic trouble, these reserves help pay debts and maintain stability. Fourth, they facilitate currency exchange for imports and investments. Typically, central banks hold reserves in major currencies like US dollars, euros, and yen, plus some gold. The US Federal Reserve, for example, holds reserves worth hundreds of billions of dollars. These reserves essentially act as a financial cushion that demonstrates a country's economic strength to global markets and investors.