This document discusses transaction and CRM. It begins by defining e-commerce as referring to a wide variety of internet-based business models that typically incorporate marketing elements to drive users to a website to purchase products or services. E-commerce is differentiated based on whether it uses the internet, technology objectives, and areas like business-to-consumer, consumer-to-business. The importance of e-commerce is increasing as evidenced by growing revenues in Germany, with the top online shops including eBay and Amazon. Popular product categories for online purchases include books, travel, clothes and shoes.