Shading
Shading is a mode in which the objects of a model are rendered in plain colors. The objects are colored according to the colors of their materials. If Show textures is selected in graphics settings, the textures of materials is also displayed. The glass surfaces are transparent. This is the default presentation method of the model.
You can change the presentation method of the model to shaded and wire frame in turns by clicking the Shaded/Wireframe button on the tool strip.
You can also select Rendering | Render Style | Wire Frame.