期权，也称选择权，是指期权的买方有权在约定的期限内，按照事先确定的价格，买入或卖出一定数量某种特定商品或金融指标的权利。 Option, also known as option, refers to the right of the buyer of the option to buy or sell a certain amount of a specific commodity or financial indicator at a predetermined price within an agreed period of time.