Salted fish is a software to solve idle items. Securities trading refers to trading or transferring issued securities in the securities market. According to relevant information: Idle Fish is the App client of Alibaba's idle trading platform, and it is an application software that can solve idle items. Securities trading is a transaction of securities issued according to law and subscribed by investors, a transaction of specific rights with property value and a transaction of standardized contracts. The ways of securities trading include spot trading, futures trading, option trading, credit trading and repurchase.