The first chapter introduces the mission of the book which is the understanding of why complex systems and an interdisciplinary approach can have a crucial role in designing future networks. By discussing the evolution from 1G to 6G, the following chapter shows how integrating artificial intelligence, social sciences, and biology addresses emerging challenges such as energy efficiency, security, and complexity management. This innovative perspective enables the development of a resilient and adaptive network that can meet the future demands of the upcoming and ever-evolving digital society.