Eeny, meeny, miny, moe
Culling is when you try to reject objects that can not be seen as soon as possible. Objects in this case can be any amount of surfaces.
Frustum: What is visible inside your view.
Portals: Use 'doors' to find out if you can see things on the other side.
Potentially Visible Sets: Precalculate what is visible.
Occlusion Culling: Render things to learn if they are visible.
Hierarchical: If you can't see the boss the minions is invisible.