Illustration is the process of applying an image (usually drawing or painting) to a communications problem, usually for an outside client. Great skill in drawing and painting are central to this area of work. Projects can range from Op Ed illustrations, to drawings for ad campaigns, to images that accompany magazine articles. Illustration is a relatively diverse field — it can come quite close to graphic design, in that it can sometimes involve the use of typography and page layouts, and it also can come quite close to fine arts in that a drawing or painting may be nearly indistinguishable from non-commercial work.