This source introduces and explains Pinduoduo, a rapidly growing e-commerce platform in China. It details how Pinduoduo has quickly become the second-largest EC service by user count, surpassing established players like JD.com, despite having a lower gross merchandise volume (GMV). The text highlights Pinduoduo's unique group buying model, where prices decrease as more people join a purchase group, facilitated through social media sharing. This innovative approach is described as a C2B (Consumer to Business) service and social commerce, leveraging the Chinese cultural tradition of referral-based purchasing. The article also touches upon the platform's initial struggles with quality control and how it has evolved, while noting its ongoing challenge of achieving profitability amidst increasing competition.