The needle in the simplest backstitch comes up from the back of the fabric, makes a stitch to the right going back to the back of the fabric, then passes behind the first stitch and comes up to the front of the fabric to the left of the first stitch. The needle then goes back to the back of the fabric through the same hole the stitch first came up from. The needle then repeats the movement to the left of the stitches and continues.