Drawing mediums are referred to as either dry or wet. Both types can be combined in countless ways to produce everything from quick, hard contour lines to rich, graceful gradations.
Dry Mediums
Clockwise: Soft pastels, colored pencils, oil pastels, hard pastels, conté pencils and sticks, graphite pencils and sticks, charcoal pencils and sticks
Wet Mediums
Watercolors and colored pencils