Embroidery Stitch Definition

In everyday language, a stitch in the context of embroidery or hand-sewing is defined as the movement of the embroidery needle from the backside of the fabric to the front side and back to the back side. The thread stroke on the front side produced by this is also called stich. In the context of embroidery, an embroidery stitch means one or more stitches that are always executed in the same way, forming a figure of recognisable look. Embroidery stitches are also called stitches for short.
Embroidery stitches are the smallest units in embroidery, embroidery patterns are formed by doing many embroidery stitches, either all the same or different ones, either following a counting chart on paper, following a design painted on the fabric or even working freehand
Common Stitches
Embroidery uses various stitches and combinations of stitches. Each embroidery stitch has a special name to help identify it, and although they are mostly simple to execute, when you put them together the results can be extremely complex.

back stitch
          for outlining shapes

blanket stitch
         as the name implies, an edging stitch to prevent fraying, but also decorative.

chain stitch
cross-stitch (or X-stitch)
couching
         Attaching a thread to a piece of fabric by sewing it on. Specialist couching stitches: Pendant couching,Bokharacouching, Square laid work.

fly stitch
         Looped stitch, suitable for either repeat or random patterns.

Holbein stitch
knots:

bullion knots
Used as filling stitch or in a line. Worked by twisting thread around the needle.
    2.   French knots

lazy daisy stitch
running stitch
 stem stitch
Used for lines and stems, but also used as an infilling stitch.

whip stitch
Specialist stitches such as the Quaker stitch used on the Quaker tapestry