Low-emissivity (Low-E) glass is a type of window glass designed to reduce the amount of infrared and ultraviolet light that passes through it while still allowing visible light. This is achieved by applying a thin, transparent coating that reflects heat back into the room during winter and keeps it out during summer, improving energy efficiency. Low-E glass is commonly used in residential and commercial buildings to enhance insulation and reduce energy costs. By minimizing heat transfer, it helps maintain comfortable indoor temperatures and can also protect furnishings from fading due to UV exposure.