Proofreading traditionally means reading a proof copy of a text in order to detect and correct any errors. Modern proofreading often requires reading copy at earlier stages as well.
The term proofreading is sometimes used incorrectly to refer to copy-editing. This is a separate activity, although there is some overlap between the two. Proofreading consists of reviewing any text, either hard copy (on paper) or electronic copy (on a computer) and checking for typos and formatting errors. This may be done either against an original document or "blind" (without checking against any other source).
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