Rudra, B.2026-02-082020IoT Technologies in Smart-Cities, 2020, Vol., , p. 41-619.78E+12https://doi.org/10.1016/j.matdes.2025.114603https://idr.nitk.ac.in/handle/123456789/33787A smart city uses various technologies to make the lives more easy and simple fulfilling the demands of the increasing population. Internet of Things (IoT) plays a major role in making the city smart. It takes the required input and helps to make the things associated with it smart. Some of the smart operations include water and energy management which is becoming scarce. The system can be deployed in the cities to make things work and save future resources. A smart city can be empowered to increase the quality of life of the people and improve the environment to sustain for a long time. Implementing a smart city with IoT and connected technology helps enhance the quality, performance and interactivity of urban services, optimize resources and reduce costs. The chapter briefly discusses what is the role of IoT in smart cities describing the basics of what is IoT and what comprises a smart city followed by smart city segments. Benefits of IoT and their impact on the smart city along with the national and international case studies. At the end of the chapter, some of the challenges associated with the IoT with respect to smart cities. © The Institution of Engineering and Technology 2020.Cost reductionCosts reductionEnergy management systemsEnvironment improvementInternet of thingsInternet of things impactIoTPublic administrationQuality of lifeSmart citiesSmart city segmentsTown and country planningUbiquitous and pervasive computingUrban servicesWater-energy management