This chapter introduces the motivation and scope of the book, emphasizing the need for a structured framework for understanding nonlinear networked systems and control. It highlights the spectrum of research in systems and control from the perspectives of steady-state and transient performance, as well as control conditions. The chapter establishes the book’s goal of systematically organizing recent advancements in the field, providing a foundation for deeper exploration and innovative research. It serves as a roadmap, outlining the book’s structure and thematic progression.