As the name implies, its content includes two aspects, one is electronic mode, and the other is business activities. E-commerce refers to the use of simple, fast and low-cost electronic communication methods to conduct various business activities without meeting buyers and sellers. E-commerce can be completed through various electronic communication methods. Simple, for example, you conduct business activities with customers by phone or fax, which seems to be called e-commerce; Now people are discussing e-commerce, mainly through EDI (Electronic Data Interchange) and the Internet. Especially with the maturity of Internet technology, the real development of e-commerce will be based on Internet technology. So some people call e-commerce IC (Internet Commerce) for short. From the perspective of trade activities, e-commerce can be realized in multiple links, or it can be divided into two levels. The lower-level e-commerce is e-commerce, e-trade, e-contract and so on. The most complete and advanced e-commerce should be to use the Internet to carry out all trade activities, that is, to completely realize information flow, business flow, capital flow and partial logistics on the Internet. In other words, you can negotiate with customers online, place orders, pay (receive) money, open electronic invoices and even pay taxes through electronic customs declaration in one go. To achieve a complete e-commerce will involve many aspects, besides buyers and sellers, banks or financial institutions, government agencies, certification bodies, distribution centers and other institutions need to join. Because the parties involved in e-commerce don't know each other physically, the whole process of e-commerce is not a copy of business activities in the physical world. Online banking, online electronic payment, data encryption, electronic signature and other conditions and technologies play an important and indispensable role in e-commerce. E-commerce is a form of trade in which all kinds of entities (production enterprises, commercial enterprises, financial enterprises, government agencies, personal consumption, etc.) participate. ) have the ability and demand for business activities. In order to overcome the limitation of time and space and improve the efficiency of business activities, computer networks and various digital media technologies are used to realize commodity trading, service trading and intellectual property trading. 1. According to the object involved in the transaction (1) E-commerce between enterprises and consumers B to C This is a form in which consumers directly participate in economic activities by using the Internet, similar to e-retail commerce. (2) B to B mode e-commerce among B to B enterprises is the most important and valuable form of e-commerce application. (3) E-commerce between enterprises and governments B to G This business activity covers all kinds of affairs between enterprises and government organizations. (4) E-commerce between consumers C-to-C transactions conducted by individuals using the Internet. (5) E-commerce between consumers and government