Integrating IoT technology transforms urban cities into connected intelligent ecosystems that substitute the previous urban design framework. The document analyzes IoT uses to identify production challenges and rewards during innovative city development. Real-time data collection alongside automation with AI-based artificial intelligence enables the Internet of Things to reach sufficient urban governance levels that improve transportation systems while preserving energy and tracking environments, defending the public, and providing innovative healthcare services. The expanded adoption of IoT solutions within smart communities results in four principal challenges, combining security threats for networks with privacy risks for data and complex exchange issues and costly implementation expenses. This paper studies 5G network development while exploring the uses of blockchain technology for IoT security protection edge and fog processing systems, as well as energy-efficient IoT solutions. Worldwide case studies demonstrate best practices for IoT-based smart city deployments through which the paper develops security protocols for scalability purposes. Achieving extensive IoT deployment needs state-of-the-art technology advancements and strict regulations that require joint efforts between different sectors to create efficient smart cities that stand up against disruptions while being environmentally sustainable.
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