It's an introduction to an agent. The full name of ib is IntroducingBroker, which is similar to the futures broker in China. It can be an institution or an individual, and most of them are institutions. It refers to a business model in which a securities company, as an introduction broker or futures trading assistant of a futures company, helps the futures company attract customers, helps the futures company to open accounts for customers, accepts orders from customers and delivers them to the futures company for execution.