Low-E coatings, or low-emissivity coatings, are thin layers of material applied to glass surfaces to improve energy efficiency. These coatings reflect infrared light, keeping heat inside during winter and blocking it during summer, which helps maintain a comfortable indoor temperature. These coatings also allow visible light to pass through, ensuring that natural light enters buildings without compromising energy savings. Low-E coatings are commonly used in residential and commercial windows, contributing to reduced energy costs and enhanced comfort in spaces. They are an important feature in modern energy-efficient buildings and sustainable architecture.