Final answer:
Hatching and crosshatching are drawing techniques that use non-overlapping parallel lines to convey darkness or lightness in a drawing.
Step-by-step explanation:
Hatching refers to the use of parallel lines laid down beside one another to create areas of shade, with the closer together the lines, the darker the shade created. Crosshatching is used to create even darker areas of shade by crossing the first set of hatching lines with a second set on an angle. This technique is commonly used in media where only lines can be produced, such as etching.