E-commerce activities have 3 main subjects: Government (G – Government), Business (B – Business) and Customer (C – Customer or Consumer). Accordingly, in Vietnam, there are mainly B2B (Business to Business), B2C (Business to Customer) and C2C (Customer to Customer) models, specifically: B2B (Business to Business): is understood as E-commerce between businesses through e-commerce platforms, websites or e-commerce channels of each business. B2C (Business to Consumer) is understood as E-commerce between businesses and final consumers through the internet. Different from the B2B model, the B2C sales model is a traditional retail model but implemented on an e-commerce website or through other transaction channels via the internet. C2C (Customer to Customer) is a model of purchasing and selling transactions between individuals and individuals in the online environment and through a third party. This third party could be an auction or sales intermediary. Examples of this business model are eBay and Amazon. In which, eBay is a leading auction site, allowing individuals to list goods for customers to choose for auction, and Amazon is the world’s largest online retailer. Both of these websites operate both B2C and C2C models at the same time, allowing businesses to market goods directly to customers and allowing users to sell goods to each other.