Retouching is a post production process that focuses on aesthetic enhancements of the subject. Examples include blemish removal, under eye bag reduction, removal of stray hairs, correction of wardrobe malfunctions, general skin and eye enhancements, and anything else necessary to polish the image. The results of retouching are meant to look natural.
Retouching is a manual and artistic process that relies on the tasteful discretion of the photographer working on your project. Retouching should not be confused with any automated process available on consumer apps and social media filters.