Artwork overlays are a type of acetate, which is a transparent sheet made of cellulose acetate. Acetates are used in a variety of ways, including as artwork overlays. Artwork overlays are used to protect artwork from damage or to add a layer of protection to artwork that is already in place. They can also be used to create a unique look for artwork, such as adding a glossy finish or a matte finish. Artwork overlays are often used in the printing industry, as they provide a protective layer between the artwork and the paper.