When you want to display a rendering of a three-dimensional object as part of the UI, a Model frame is your basic tool. These frames provide a rendering environment which is drawn into the backdrop of their frame, allowing you to display the contents of an .m2 file and set facing, scale, light and fog information, or run motions associated with the model.

It's comparatively rare to see the basic Model type used; most renderings of models in the stock UI and mods use PlayerFrame to display players, pets and mounts.