Cloud computing is considered the evolution of a variety of technologies that have come together to change an organizations' approach for building their IT infrastructure. Actually, there is nothing new in any of the technologies that are used in the cloud computing where most of these technologies have been known for ages. It is all about making them all accessible to the masses under the name of cloud computing. Cloud is not simply the latest term for the Internet, though the Internet is a necessary foundation for the cloud, the cloud is something more than the Internet. The cloud is where you go to use technology when you need it, for as long as you need it. You do not install anything on your desktop, and you do not pay for the technology when you are not using it.This book is emphatically focused on "the concept". Understanding the fundamental ideas, principles, and techniques is the essence of a good implementation of cloud computing. This book will help you understand the best practices based on actual field experience transitioning on-premises enterprise IT services to a cloud-based environment. Whether you are still planning or ready to implement your long-term cloud strategy, this book will help you evaluate existing cloud technologies and service providers. We cover the cloud from two perspectives: as a consumer of cloud services and as an owner/operator of your own enterprise private or hybrid cloud. Knowledge acquired in the real world is analyzed from the perspectives of operations, security, billing and finance, application transformation, and deployment. Each of these learned lessons are then converted into best practice checklists to save you and your organizations countless dollars and time. Through this book, we hope that you will see the absolute necessity of understanding Cloud Computing. This textbook is intended as a guide for an explanatory course of Cloud Computing for the Graduate and Post Graduate Students of several Universities across the world.