Arbitrage, also known as spread trading. Usually refers to a trading strategy where a physical or financial asset (in the same or different markets) has two prices and is bought at a lower price and sold at a higher price to obtain returns. In the digital asset market, common arbitrage methods include futures and spot arbitrage, fund rate arbitrage, futures arbitrage, brick shifting arbitrage, and other different arbitrage strategies. In general, arbitrage exchanges involve much smaller fluctuations in contract price spreads than single contract price fluctuations, and have a much higher probability of profitability. At the same time, arbitrage is a two legged approach, so arbitrage trading is often the main investment choice for traders with large amounts of funds or a stable style. In practice, based on the stable returns and the ability to accommodate a large amount of funds, large investment institutions often choose arbitrage trading as their main trading strategy.