Central banks play a paramount role in influencing currency movements, as their policies directly impact a nation's money supply, interest rates, and overall economic health. Key central banks, such as the Federal Reserve (US), European Central Bank (ECB), Bank of Japan (BOJ), and Bank of England (BOE), wield significant power. Their primary tools include: Interest Rate Decisions: Raising interest rates typically makes a currency more attractive to foreign investors seeking higher returns, increasing demand and strengthening the currency. Lowering rates has the opposite effect. Quantitative Easing (QE) / Quantitative Tightening (QT): QE involves injecting money into the economy by buying bonds, which can devalue the currency, while QT involves reducing the money supply, potentially strengthening it. Forward Guidance: Central bank communication about future policy intentions can preemptively influence market expectations and currency valuations. Intervention: Direct buying or selling of their own currency in the open market to influence its value, though this is less common now. Traders closely scrutinize central bank announcements, meeting minutes, and speeches for clues about future policy direction, as these are often the primary drivers of significant and sustained currency movements.