Art created using only ink marks on a white or light-colored paper or other appropriate surface.
Technical pens are what I use most often; my style tends to rely heavily on cross-hatching, requiring uniformly weighted lines. But occasionally I'll use old-fashioned dip pens which allow more fluid and varied line weights.
Pen and ink drawings accented by watercolor wash. (Also known as "line and wash")
I use the technique mainly for studies and for illustrations. When I want the art to be more spontaneous, light-hearted, and in general, more loosely done (less pen detail), I opt for this technique.
Original art available for purchase.