The digital model is a virtual wireframe of points and the edges that connect them. It defines the shape of a character. The wireframe model of Lotso above is a visual representation of what a digital model might look like.
Character design starts with artists who create sketches and clay sculptures, called maquettes, to get each character just right. Then a digital modeler creates a virtual 3D model of the character, sometimes digitally scanning the maquette to use as a reference. Digital Modelers have to understand anatomy, as knowing where the bones and muscles sit affects the surface shape.