Objective of this lecture paper is Identify the major categories and trends of Electronic Commerce Systems. Identify the essential processes of an Electronic commerce system, and give examples of how they are implemented in E-commerce applications. Identify and give examples of several key factors and Web store requirements needed to succeed in E-commerce. Identify and explain the business value of several types of E-commerce marketplaces. Discuss the benefit trade-offs of several E-commerce clicks and bricks alternatives.