Proofreading is the final stage of the writing process when the paper is evaluated for mechanical correctness, such as grammar, punctuation, spelling, omitted words, repeated words, spacing and format, and typographical errors. You proofread only after you have finished all of your other revisions and editing. The ability to change text by adding, deleting and rearranging letters, words, sentences and paragraphs. Text editing is the main operation users perform in word processors, which typically also handle graphics and other multimedia files.