The photographs affecting negatively to the public 
sentiment and psychology should be avoided. Thus before 
publishing a photograph in any media it needs to be edited, 
whether the photo has some massage to public and should 
consider the public interest.

Photo editing is to remove blamishes, errors or unwanted 
elements using tools such as PhotoShop, Painter or others.
One of the most common uses of photo editing/retouching is 
to prepare photos for catalogues, magazines and newspapers.
Some of the best photo editors/retouchers produce posters 
and post cards. Self employment in this area is usually 
associated with event photography such as weddings, class 
pictures, boudoir photos and so on. Hope this helps.
I believe the answer before confused the work of an art 
director with the craft of photo editing.

coz i hate computers

minimum requirements of system.