This comprehensive guide explores Fill or Kill (FOK) orders, a powerful trading instrument for cryptocurrency markets. The article examines fundamental order types including market and limit orders, then details FOK orders' all-or-nothing execution mechanism that ensures complete fulfillment at specified prices or instant cancellation. FOK orders excel in high-liquidity markets, providing rapid execution, price certainty, and simplified risk management—making them ideal for day traders and scalpers. However, traders must understand the execution risks in lower-liquidity environments and the psychological demands of split-second decision-making. The guide provides practical recommendations for implementing FOK strategies on platforms like Gate, comprehensive FAQs addressing key concerns, and insights on how FOK orders compare to IOC and GTC alternatives, empowering traders to maximize this precise order type effectively.