There has been extreme hype about Cloud Computing from years and this word is in headlines of IT world news. Why not? Cloud computing has revolutionized the entire paradigm of computing and technology and has helped businesses in coming closer to technology. This book covers basics of Virtualization and Cloud Computing along and also includes various practices that is followed by Major Service Providers in the current market. Virtualization is the core engine of Cloud Computing and is the base of how the services are provided to the consumers. Cloud computing procedures and techniques for supporting business processes and applications. The details of various layers of Cloud Computing - IaaS, PaaS and SaaS. The book also describes the details and differences between various deployment models of Cloud, i.e. Private Cloud, Public Cloud, Hybird & Community Cloud. The book also covers the overview of how the major service providers for all the types of cloud services in the market use various technologies and provides efficient services to the customers. The book describes features and services offered by various service providers in all the models of cloud, Infrastructure as a Services, Platform as a Service & Software as a service. The major service providers covered in this book are Amazon Web Service, VMware VCloud Director, GoGrid & Rackspace in Infrastructure as a Service. Major service providers in Platform as a Service covered in this book are Microsoft Windows Azure, Heroku, VMware CloudFoundary, Google App Engine & Force.com. Major service providers in Platform as a Service covered in the book are Microsoft Office 365, SalesForce, Workday & Google Apps.