While the 5th Generation (5G) system is being widely deployed across the globe, the research and consensus building for the 6th generation (6G) are already well underway with high expectations toward the merger of digital, physical and human worlds. The main goal of this book is to introduce the upcoming 6G technologies and outline the foreseen challenges, enablers, and architectural design trends that will be instrumental in realizing a Sustainable and Trustworthy 6G system in the coming years. The envisioned 6G system promises to offer a more advanced and comprehensive user experience not only by achieving higher speeds, larger capacity, and lower latency, but also much more improved reliability, greater energy efficiency, and an enhanced security framework while natively integrating intelligence end-to-end (E2E). Achieving these goals will require innovative technological solutions and a holistic system design that considers the needs of various stakeholders and future 6G use cases. Capitalizing on the 5G Public-Private-Partnership (5G PPP) Phase 3 projects and the join efforts between the Architecture Working Group and the flagship Hexa-X project, this book delves into the critical challenges and enablers of the 6G system, including new network architectures and novel enhancements as well as the role of regulators, network operators, industry players, application developers, and end-users. Accordingly, this book provides a comprehensive overview of the current research activities on 6G and sets a solid cornerstone towards a more connected, intelligent, and sustainable world.