One of the neatest features (in my humble opinion) of the some pen
tablets is pressure sensitivity. Your drawing program has to support
this feature, and most of the better ones (and some low-end ones) do.
This gives you a more “brush-like” effect, rather than consistent
width lines. Very neat for scribbling and doodling for creative
inspiration. You can adjust the sensitivity, and exaggerated levels
lead to some interesting results.