Alibaba Group is a Chinese conglomerate comprised of various ecommerce subsidiaries. It is preparing for a major IPO that could value the company at $100-$150 billion. The document discusses the major subsidiaries, including Alibaba.com (B2B marketplace), Taobao (C2C marketplace), Tmall (online shopping mall for brands), Alipay (leading online payment system), AliExpress (international B2B marketplace), 1688.com (domestic B2B site for small businesses), and others. It provides facts, figures, and key talking points about the companies and Alibaba Group's expansion strategies.