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 match the overall style of the building. In addition to their functional role, sills can also enhance the aesthetic appeal of a home. They can be decorative, featuring intricate designs or finishes. Proper maintenance of sills is important to ensure they remain effective in protecting the structure from the elements.