This essay provides a comprehensive overview of smart city development, highlighting the increasing urbanization and the need for sustainable urban models. It discusses the evolution of the smart city concept, driven by advancements in ICT and the Internet of Things (IoT), emphasizing the goals of improving city efficiency, achieving sustainable development, and enhancing the quality of life for citizens. The essay outlines the six key dimensions of smart cities: smart economy, smart people, smart governance, smart mobility, smart environment, and smart living, detailing how each contributes to a holistic and integrated urban system. It also presents Singapore as a case study, showcasing its Smart Nation program and milestones in becoming a leading smart city through digital transformation and technological innovation, all aimed at improving the lives of its citizens and building stronger communities.