This book provides a comprehensive introduction to Web3 from the perspectives of technology (cybersecurity, open source, etc.), entrepreneurship, finance, regulation and sustainability, and the international industrial landscape. Combining business theories with technical practice and cases, the book offers an overview of the evolution, concepts, technical foundation and applications of Web3. In preparing the book, the authors did a great number of research and extensively collected opinions on hotspot issues in this regard. Thus, the book is both a manual that can help readers quickly find Web3-related knowledge and a reference for research, entrepreneurship, and investment.