Digital designer can mean a lot of things...
As a 3D digital designer, I am specialized in 3D modeling for new concepts (I work directly with designers by interpreting their drawings) and I am also able to make renderings and animations in order to show the product in a different way.
I work on several software i.e. Alias Studio, Rhino, 3ds max, Patchwork, Première, After Effects, Photoshop, Illustrator...
"The way you show a product is as important as the product itself" JP Ploué