Taking a photo with a digital camera is turning infinite shades of colour into discrete samples of the original image and details smaller that the size of those discrete samples (pixels) can be lost - putting what you see into tiny little squares. Because of this generally all photos you take will benefit from being sharpened. Sharpening is the process of emphasizing tiny edge details, making the photo appear to be more sharply focused - giving it more detail.
Sharpening is best applied after any other post processing like changing saturation, or colour.
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