contour lines- are used to define edges. the creat boundaries around on object.
dividing lines- also define edges, but what distinguishes them drom counter lines is they divided space. the lines between culoms of txt.
decoration lines- used to embellish an object. cross hatching is an example of using decoration lines to add shading and form to an object.
gesture line- are quick and rough continous line use to capture form and movement. they are generally used when studying the shape and motion of the human form.