A very short answer is the size...

We've used the term decal to refer to our single panel peel & stick prints which are offered in large poster sizes up to 62" x 42" (depending on the specific map). These apply to wall like a giant sticker, but the material itself is like a very finely woven canvas. I've attached a few detail images of the fabric.

We've used the term mural to refer to the extra large single panel prints (this map would be 89" x 60" for example) and the multi-panel full wall-coverage maps. These are offered in 3 panel or 8 panel configurations up to 166" x 112". The multi-panel murals we offer in a choice of the peel & stick material or wallpaper stock. I hope this helps!

1-World