the catering units that need traffic are small and medium-sized catering businesses. Because small and medium-sized businesses need to build their own traffic pool, which is called private domain traffic. Private domain traffic is relative to public domain traffic, and the traffic brought by the platform is not controlled and owned by catering businesses. These are the so-called public domain traffic. To put it simply, the public domain traffic is that catering businesses catch customers together in the US group and Hungry. Whether it can be caught or not is still unknown. The private domain traffic is to raise customers by itself, and the customers inside are all catering businesses. It can be said that private domain traffic is an old customer owned by catering businesses, which can be freely controlled, free of charge and used many times, and reaches users directly for free.