Drawing is a means of making an image, using any of a wide variety of tools and techniques. It generally involves making marks on a surface by applying pressure from a tool, or moving a tool across a surface. Common tools are graphite pencils, pen and ink, inked brushes, wax colour pencils, crayons, charcoals, pastels, and markers. Digital tools which can simulate the effects of these are also used. The main techniques used in drawing are line drawing, hatching, crosshatching, random hatching, scribbling, stippling, and blending. An artist who excels in drawing is referred to as a drafter, draftswoman, or draughtsman. Drawing can be used to create art used in cultural industries such as illustrations, comics and animation.