This book is an introduction to the complex and emerging world of the Parallel and Distributed Computing. It helps you understand the principles and acquire the practical skills of MPI programming using the C/FORTAN programming language. My aim is for you to gain sufficient knowledge and experience to perform simple useful programming tasks using the best up-to-date techniques and so I hope for it to be the easiest book from which you can learn the basics of MPI programming. It helps you understand the principles, algorithm & implementation of Parallel and Distributed Computing. This book is emphatically focused on the concept. Understanding the fundamental ideas, principles, and techniques is the essence of a good programmer. Only well-designed code has a chance of becoming part of a correct, reliable, and maintainable parallel and distributed system. Through this book, I hope that you will see the absolute necessity of understanding Parallel and Distributed Computing. I have taken a top-down approach, addressing the issues to be resolved in the design of distributed systems and describing successful approaches in the form of abstract models, algorithms and detailed case studies of widely used systems. The book aims to provide an understanding of the principles on which the parallel and distributed computing are based; their architecture, algorithms and design; and how it meets the demands of contemporary parallel and distributed applications. I began with a set of several chapters that together cover the building blocks for a study of parallel and distributed systems. The first few chapters provide a conceptual overview of the subject, outlining the characteristics of parallel and distributed systems and the challenges that must be addressed in their design: scalability, heterogeneity, security and failure handling being the most significant. These chapters also develop abstract models for understanding process interaction, failure and security. Simply In Depth....