Cloud cities are futuristic urban environments that exist high above the ground, often in the atmosphere or within clouds. These cities are designed to utilize advanced technology and sustainable practices, allowing for a unique living experience that minimizes the impact on the Earth's surface. They may feature floating structures, renewable energy sources, and innovative transportation systems. The concept of cloud cities has been popularized in various forms of media, including science fiction films and literature. Notable examples include the Star Wars franchise's Cloud City, which showcases a city built on a gas giant, and the imaginative visions of architects and designers exploring the possibilities of aerial living.