A window sill is the horizontal ledge or surface at the bottom of a window frame. It is typically made of wood, stone, or other materials and serves both functional and aesthetic purposes. The sill helps to support the window and can also prevent water from entering the building during rain. In addition to its structural role, a window sill can be used for decorative purposes. People often place items like plants, candles, or photo frames on window sills to enhance the appearance of a room. It can also provide a small space for enjoying natural light and views from the window.