This book focuses on risk management through fuzzy logic for uncertainty in Share Market, Business Decision, Customer Decision in Internet Marketing, and Cloud computing. Risk management is a process of identifying, assessment, and prioritization of risk in business. The goal of risk management is to protect business from unexpected results. Risk management also use to protect employees, customers from negative results. Fuzzy logic was used since it is a tool capable of modeling complex and uncertain or vague data using simple terminology such as IF-Then statements. Fuzzy rule based expert system is very effective for knowledge representation of any system. It is an essential tool which balances the economic, social and environmental benefits The fuzzy rule base can be use to optimize the E-Commerce services and rule discovery facilities and could be used to optimize policy knowledge. E-Commerce rule based fuzzy models provide a powerful and robust tool for encapsulating and exploiting knowledge. This book will help the customer for decision making in share market, where buying and selling of shares takes place from anywhere, wherever with the help of internet connected computer.