Arbitrage is an investment strategy that profits from exploiting price differences of the same asset across different markets. In the cryptocurrency market, common arbitrage methods include spot-to-derivatives arbitrage, funding rate arbitrage, and cross-futures trading arbitrage. Although arbitrage is theoretically risk-free, there are various risks in practice, such as liquidity and liquidation risks. Successful arbitrage requires identifying opportunities, calculating returns, determining positions, placing bilateral orders, and continuous monitoring. The existence of arbitrage stems from market inefficiencies, and new opportunities will continue to emerge in the future.