Edges of different types can be displayed using different colors and linetypes. You can also add special effects such as jitter and overhang to edges.
In a shaded or a wireframe model, the visual style sets the visibility and appearance of isolines, facet edges, silhouette edges, obscured edges, and intersection edges. Facet edges (the edges between planar faces representing a surface) are displayed only when the angle between the facets is smaller than the crease angle value you specify.
Edge modifiers such as Overhang and Jitter produce the look of a model that is still in the conceptual phase. Jitter makes lines look as though they were sketched with a pencil. Overhang produces another kind of hand-drawn effect.