Window panes are flat pieces of glass that are used in windows to allow light to enter a building while keeping out wind and rain. They can be made from various types of glass, including tempered or double-glazed glass, which provides better insulation. Window panes are typically framed in wood, vinyl, or metal to secure them in place. In addition to their practical function, window panes can also enhance the aesthetic appeal of a building. They come in different shapes and sizes, and some may be treated with coatings to reduce glare or improve energy efficiency. Proper maintenance of window panes is essential for longevity and clarity.