The book "Emerging Technologies in Software-Defined Networking" provides a thorough examination of the latest advancements, trends, and challenges in the field of Software-Defined Networking (SDN). With a focus on cutting-edge technologies and their impact on network architectures, protocols, and services, this book serves as an essential resource for researchers, practitioners, and students seeking to stay abreast of the rapidly evolving landscape of SDN. The journey begins with an exploration of the evolution of networking, tracing the historical context and technological developments that have led to the emergence of SDN. From the early days of traditional networking architectures to the paradigm shift towards programmable, centralized control, The book sets the stage for understanding the foundational principles and motivations behind SDN. The book provides an overview of traditional networking architectures, including client-server models, routing and switching, hierarchical design, protocols, standards, and security considerations.