Basic Embroidery Stitiches : Blanket Stitch

Blanket stitch is a variation of buttonhole stitch.

Other variations of buttonhole stitch include: eyelet stitch, and detached buttonhole stitch. 

Uses:
Blanket stitch was used to finish the raw edges of coverings and wraps. Blanket stitch is most appropriate for tightly woven or felted fabrics that do not unravel easily. For woven fabrics that fray, such as fine plain weave cotton or linen, buttonhole stitch is more appropriate.

Blanket Stitch can be used as a decorative stitch in Surface Embroidery.

Blanket stitch can also be used in applique work to secure the applique to the main fabric 

Blanket stitches are placed at a distance from each other; generally the length of the “L” is equal to its width.

I have used Blanket stitch to sew up this lovely felt stocking.

Also check:
Basic Embroidery Stitches