Sills are horizontal structures found at the bottom of windows and doors. They serve as a support for the frame and help to direct water away from the building, preventing moisture damage. Sills can be made from various materials, including wood, stone, or metal, and are often designed to complement the overall architecture of a building. In addition to their functional role, sills can also enhance the aesthetic appeal of a space. They can be used as a ledge for plants or decorative items, adding character to both interior and exterior settings. Proper installation and maintenance of sills are essential for ensuring their longevity and effectiveness.