Backstitch is a sewing
technique that involves creating small zigzag stitches with the purpose of tightly join two fabric pieces together. This technique provides strength and stops the material from coming apart. The sew together may be used for a variety of stitching projects, such as finishing the edge, stitching appliques, or even creating blankets. It offers a neat and skilled look for the finished
item.
How to Whipstitch with Pictures wikiHow