Business-to-Business (B2B): A type of transaction that exists between businesses, such as one involving a manufacturer and wholesaler, or a wholesaler and retailer. This is primarily how Alibaba operates.
Alipay: A third-party mobile and online payment platform established by Alibaba group. It's similar to PayPal but mainly used within China.
Taobao: An online shopping website owned by Alibaba. It's similar to eBay with consumer-to-consumer shopping but is primarily used in China.