Edged and plain faces? So I've never done it but now that I see other models with it everywhere I wonder why? I included pictures because I'm bad at describing things. (This is also why I ask here, I don't know what terms I'd search for)

-Is it needed or recommended to use edged faces? If so, please explain what you'd use them for in modeling or animating.

Plain Face


Edged Face


Thank you.
Quads are not always necessary, but are usually preferred when deforming a mesh for animation &amp;/OR Rigging. If you are creating a static model (eg. a sculpture of a statue, etc...) Then it can be acceptable to use Triangulated faces, as there is no reason to worry about the integrity of the deformations.

Notice the deformation smoothness when we bend a cylinder.




As for my version of face Definitions:

NGon technically a face with vertices > 3, but because we have names for 3 vert, and 4 vert faces, this is commonly reserved to describe a face >= 5.

Quad = 4 vertices.

Triangulated is just the primitive minimum for a face to exist, as the vertices that make it up = 3. 

Two vertices make an edge with no area. 

One is just a single point (Vertex).