Ornamental molding refers to a continuous decorative strip or contoured element used to outline, frame, or enhance the surfaces and transitions of a building's interior and exterior. Traditionally crafted from wood, plaster, stone, or masonry, these moldings serve both aesthetic and functional purposes by adding visual depth, character, and rhythm while concealing gaps between different materials, such as where a wall meets a ceiling or floor. Common types include crown molding, baseboards, and chair rails, often featuring classical motifs like egg-and-dart, dentils, or acanthus leaves that reflect various architectural styles from Greco-Roman antiquity to modern design.