This book offers a multidisciplinary exploration of a major paradigm shift in the automotive industry: the transition from traditional system integration to dynamic ecosystem collaboration. It draws on scientific research from LocosLab GmbH and the University of Duisburg-Essen, Germany, alongside practical insights from Deloitte’s Global Automotive Practice. The book examines how automotive companies increasingly cooperate within innovation and transaction ecosystems. It explores the technical architecture of these ecosystems, including customer applications, middleware, and backend systems. Key topics include the evolution of software-defined vehicle innovation ecosystems, challenges in homologation, opportunities for business development, and the changing role of traditional OEMs. It presents the global status quo of Mobility as a Service (MaaS) ecosystems and explores their future coexistence with private car ownership, again highlighting the strategic implications for OEMs.The book aims to provide inspiration, appeal to both academics and practitioners, and encourage collaboration between different disciplines.