A window sill is the horizontal ledge at the bottom of a window frame. It can be made from various materials, such as wood, stone, or plastic, and serves both functional and aesthetic purposes. Functionally, it helps to support the window and can prevent water from entering the building. In addition to its practical role, a window sill can be a decorative space. People often use it to display plants, such as houseplants, or decorative items like picture frames. It can also provide a small area for sitting or resting items, enhancing the overall look of a room.