Web engineering is the discipline focused on the techniques, tools, and methodologies employed in the development of web applications. It includes the design, development, evolution, and evaluation of these applications. As an interdisciplinary field, web engineering integrates principles from software engineering, hypertext engineering, human-computer interaction, user interface design, information engineering, modeling and simulation, and project management. By applying software engineering practices, web engineering introduces innovative tools, approaches, and guidelines to address the unique requirements of web-based applications. It is applied across a range of application types, including semantic web applications, workflow-based systems, collaborative platforms, transactional applications, interactive solutions, and portal-oriented frameworks. Web engineering is an upcoming field of science that has undergone rapid development over the past few decades. This book provides comprehensive insights into this field. In this book, constant effort has been made to make the understanding of the difficult concepts of web engineering as easy and informative as possible, for the readers.