The key technology in developing smart city solutions is the use of Internet of Things (IoT) devices. These interconnected sensors and systems gather and analyze data from various city infrastructures, such as traffic lights, public transportation, and energy systems. This data enables real-time monitoring and management, improving urban living through enhanced efficiency and sustainability. Technologies like big data analytics, cloud computing, and artificial intelligence are also integral components that help cities adapt to challenges, make informed decisions, and enhance the quality of life for residents.