Perforated refers to materials that have been pierced with holes, typically with uniform profiles and spacing. Perforations can be applied to a variety of materials including metal, plastic, paper, leather, textiles, and wallcoverings. Depending on the type of material, perforating can add a host of performance and aesthetic attributes including weight reduction, sustainability, increased traction and friction, ventilation, drainage with fluid permeability, heat diffusion, sound absorption, and light permeation.