This book explores the cloud architecture and covers all aspects of topics like parallel, distributed, grid computing, virtualization, services, disaster recovery and security in cloud and its applications. The book is designed as a text for the undergraduate and post graduate students of computer science and engineering courses. Key features: Covers all important topics like introduction to Cloud Computing, Services and Standards in Cloud Computing, and Virtualization in cloud. ·Lucid, simple, and conversational language. Systematic and sequential arrangement of different topics. ·Concise and to-the-point description of all the topics. Eminently suitable for self-study. ·Each chapter contains an extensive list of exercises.