This book provides an overview of cloud computing, covering various essential topics. It begins with an Introduction to Cloud Computing, explaining fundamental concepts and benefits. Next, Cloud Computing Architecture discusses the structural framework and deployment models. Scalability and Fault Tolerance explores dynamic resource allocation and reliability measures. Cloud Management and Virtualisation Technology addresses managing cloud resources and virtualisation concepts, followed by Virtualisation, which delves deeper into virtualisation technologies. Cloud Security focuses on safeguarding data and applications, while Cloud Computing Security Architecture highlights secure design principles. Market-Based Management of Clouds examines cost-effective cloud usage, and Hadoop introduces distributed processing for big data.