2. Option, also called option, is a financial instrument based on futures. In essence, the option is to price the rights and obligations in the financial field separately, so that the transferee of the right can exercise his rights on whether to trade or not within a specified time, and the obligor must perform it. When trading options, the party who buys the options is called the buyer, while the party who sells the contract is called the seller. The buyer is the transferee of the right, and the seller is the obligor who must fulfill the buyer's right. Option trading began in the American and European markets in the late18th century. Due to the imperfect system and other factors, the development of option trading has been suppressed.