This book " Cloud Computing - An Introduction " has been mainly written for Engineering and Computer science students This book gives you detailed description about cloud computing and helps you to score good marks in your exam This has detailed concept explanation about cloud computing. Cloud computing is the delivery of computing services-including servers, storage, databases, networking, software, analytics, and intelligence-over the Internet ("the cloud") to offer faster innovation, flexible resources, and economies of scale. You typically pay only for cloud services you use, helping you lower your operating costs, run your infrastructure more efficiently, and scale as your business needs change. The concept has been explained detail with clear explanation. It gives notes on uses, advantages and disadvantages of cloud computing . The book has an important question session at last of the book for easy mark scoring for the students. Students can easily understand the concept given in the book due to easy understanding and simplified vocabulary used in the book.