Image use courtesy of Aradia's Hand
Since I'm talking about embroidery this month I thought that I would match the tutorial with it by discussing backstitching. First and foremost, backstitching is a part of cross stitch (which is a form of embroidery) that seeks to outline a group of cross stitches. It is also used in simple lettering as well. You can see it in use above in my Tree Frog Trio.
There is a specific technique to back stitching that involves stitching from point A to B (from the bottom of the cloth, through the top, then top to bottom), then moving on to C (bottom to top) and inserting the needle back at point A (top to bottom), and repeating this with all subsequent stitches.
Unlike some stitches backstitching may cover a wide area of stitches, versus only going over one square at a time. Backstitching is a bit of a decorative type of stitch, but one with a simple purpose that is very easy to do. Most any book worth it's salt will cover how to do backstitching and once learned you'll see how easy it is.