Smart cities use advanced technologies like the Internet of Things (IoT), data analytics, and sensors to optimize energy consumption, traffic flow, and waste management. For example, smart grids help reduce energy wastage by adjusting power distribution in real time, while smart traffic systems minimize congestion and lower vehicle emissions. Automated waste collection and recycling systems can increase efficiency and reduce landfill usage. Integrating renewable energy sources and encouraging sustainable urban planning can further decrease environmental footprints, making cities more livable and eco-friendly.