There are also even basting stitches and uneven basting stitches.
Even basting stitches, as the name implies, are all the same length and generally the same space apart from each other. Many people sew them in 1/4 inch increments.
Uneven basting is done by making the stitch that shows on the top of the cloth much shorter than the one on the back, or bottom of the cloth.
This can be really useful for transferring pattern marks, etc., so that you don't have to mark your fabric with a pencil or marker.