Proofreading
After the editing, it shall be made a proofreading, which ensures the graphical layout and the removal of eventual technical, spelling, grammatical and punctuation errors.
In principle, editing and proofreading go hand in hand, but at the customer's request it might be made only proofreading.
These two services are extremely important for materials, which will be printed, or those, which are intended for the general public.