Minor retouching done for proofs:

Straightening and cropping, white balance.

Typical Portrait Retouching on selected proofs for final image:

Includes the minor retouching and also adjust contrast, tonal (color) adjustments, blemish removal (typically on close up portraits).  Sharpening is applied as needed.

Major editing on images (can be performed for additional cost at client's request):

Using photoshop to perform more extensive edits to a photo.  Examples of major editing include: swapping head (or other body part) from one image to another, slimming down a face, turning a grimace to a smile, background swap.