Smart cities are connected cities , and they work in conjunction with everything from IoT sensors to open data collection and smart streetlights to provide better services and better communication. Smart cities are no longer the wave of the future.
The Three main features of a smart city are: 1) Good infrastructure especially information and communication technology infrastructure. A smart city would have an efficient transport infrastructure, health infrastructure etc that use ICT like Metro, modern diagnostic techniques 2) Good Governance.
One goal of a sustainable city is to reduce needs and reliance on surrounding areas. In addition to being environmentally sustainable, this can also be economically beneficial, and may allow a city to be more secure in the event of a natural or civil emergency.