A bannister, also known as a barrier, is a railing that provides support and safety along staircases, balconies, or elevated areas. It typically consists of vertical posts and horizontal rails, helping to prevent falls and offering stability for individuals as they navigate stairs or ledges. Bannisters can be made from various materials, including wood, metal, or glass, and are often designed to complement the surrounding architecture. They are an essential feature in both residential and commercial buildings, ensuring safety while enhancing the overall aesthetic of the space.