Do you mean where is it used? If so, it is used on woven knits and also where it isn't desirable for a cut away to show through on a thin fabric.

Welcome to Cute. We have a lot of fun here. I'm glad to see you got your question answered. This is a great spot to learn more about machine embroidery.

Welcome to the best embroidery site on the web. Sarah (South Africa)

Welcome to the Cute family. Please keep asking questions. We all ask and many of us answer.

Hi and Welcome...see you got the answers...I also use this type as a covering on baby onsies or anywhere I don't want the embroidery to "scratch" the skin...iron it on after the embroidery is done...also sometimes I iron it on my cotton quilt squares if the embroidery is a little dense...it keep the fabric from puckering and the embroidery lays very nicely...it doesn't really change the hand of the fabric very much either..