SATIN STITCHES:
A satin stitch is a series of flat stitches that are used to completely cover a section of the background fabric. These stitches are laid from side to side. A satin stitch is often used to outline and attach an appliqué to the ground fabric.

RUN STITCHES:
Running stitches are simply used to connect sewing areas in the design and for thin outlines or borders and areas of detail when a satin stitch is too large to be used.  Running stitches are only as wide as 1 strand of thread.

FILL STITCHES:
Fill stitches are used to fill large areas with color. Simplified...they are simply large areas of running stitches that are placed side by side to cover a large area.