Culling is when an object that is not the view of the camera is removed since it is not visible there would be no use to keep rendering the object that is out of view, culling is another common optimiztion system that is important for making games quicker and even more detailed but there is multiple type of types of culling.

Frustum Culling | This type of culling method the computer will check if a object is in the view of the camera and if it is not in the view of the camera the computer will stop rendering the object to save computing power

Occlusion Culling | This culling method the computer checks if an object is behind anohter object if it is then it stops rendering and saving computing power

Backface Culling | This different from the other culling methods instead of remvoing whole objects Backface culling removes the polygons of the object that are not visible or if the players camera is not facing the polygon