Pinduoduo, launched in 2015, is a social e-commerce platform that promotes 'team buying' through social media, enabling users to secure discounts by forming purchase groups. The company's growth was financed through significant investments, culminating in a $1.63 billion IPO on NASDAQ, primarily aimed at expanding operations and enhancing technology. Pinduoduo's marketing strategy leverages social media interactions, positioning itself as the third largest e-commerce entity in China but faces challenges from established competitors like Alibaba and JD.com.