Belongs to B2C. According to the different services provided to consumers, B2C models can be divided into seven categories: electronic brokerage, electronic direct selling, electronic retail, distance education, online booking, online distribution and online finance. B2B mode can be divided into seven categories: catalog mode, B2B and B2C joint operation mode, government procurement and corporate procurement, supply chain mode, intermediary service mode, auction mode and exchange mode. Among them, the intermediary service mode can be subdivided into four types: information intermediary mode, CA intermediary service, network service mode and bank intermediary service.