Book excerpt: The smart city is a driver of change, innovation, competitiveness, and networking for businesses and organizations based on the concept of the Sustainable Development Goals for the 2030 agenda. The importance of a new paradigm regarding the externalities of the environment, citizen welfare, and natural resources in cities as an impact of urban ecosystems is the main objective for sustainable development in cities through 2030. Smart Cities, Citizen Welfare, and the Implementation of Sustainable Development Goals provides innovative insights into the key developments and new trends associated with online challenges and opportunities in smart cities based on the concept of the Sustainable Development Goals. The content within this publication represents research encompassing corporate social responsibility, economic policy, and city planning. This book serves as a vital reference source for urban planners, policymakers, managers, entrepreneurs, graduate-level students, researchers, and academicians seeking coverage on topics centered on conceptual, technological, and design issues related to smart city development in Europe.