Energy-efficient design focuses on creating buildings and products that use less energy while maintaining comfort and functionality. This approach often incorporates materials and technologies that minimize energy consumption, such as high-quality insulation, energy-efficient windows, and renewable energy sources like solar panels. By optimizing natural light and ventilation, energy-efficient design reduces the need for artificial lighting and heating. This not only lowers energy bills but also decreases the environmental impact, contributing to sustainability efforts. Overall, energy-efficient design aims to create spaces that are both economical and environmentally friendly.