What is a veneer used for when attached to a wall?

A veneer, when attached to a wall, primarily serves the purpose of ornamentation. This finishing layer adds aesthetic value to a structure by providing a visually appealing surface. Veneer can be made from a variety of materials, including wood, stone, or brick, and is often used to enhance the appearance of interior or exterior walls, giving them a more refined and finished look.

While other options touch upon important aspects of construction and building materials, they do not accurately describe the primary role of a veneer. For instance, while structural support is vital in building design, veneers are typically non-load bearing and are not intended for this purpose. Electrical insulation and thermal resistance are also critical features in certain contexts, but they do not pertain to the function of a veneer, which is distinctly focused on appearance and décor.