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• Culling
  

  In general, (visibility-) culling is the process of limiting the amount of things rendered (both geometry and drawcalls) to manageable levels, so the GPU doesn't go up in flames.

• Occlusion Culling
  

  Removal of geometry that is fully hidden behind other geometry.

• Cluster Culling
  

  Replacement of geometry that is too small with lower detail geometry.

• Frustum Culling
  

  Removal of geometry that is outside the cameras view region.

• Distance Culling
  

  Removal of geometry that is too far away.

• Portal Culling
  

  Removal of geometry that is not in the same 'room'.

• Interior Culling
  

  Removal of geometry hidden within geometry.

• Back Face Culling
  

  Removal of geometry not facing the camera.