This book is designed for use in courses on A Handbook on Cloud Computing- Concepts, virtualization and Management at the undergraduate/postgraduate level, particularly designed for the structured curriculum of Computer Science & Engineering. Although the contents of the book follows the essential content of complete A Handbook on Cloud Computing- Concepts, virtualization and Management is sufficiently broad in scope and rigorous in coverage to satisfy any undergraduate and postgraduate requirements in the field of Computer Science & Engineering. The book is organized into eight sections: Section 1, covers the topics of Introduction to cloud computing, three service models, distributed system, history and evolution of cloud computing, types of cloud computing, platforms & technologies, cloud computing delivery models, practical applications & emerging applications of cloud computing etc.., Section 2, delivers the cloud computing companies and migrating to cloud, web-based business services, seven step model of migration to the cloud, risks in cloud computing, risk assessment etc.