In the publishing world, proofreading is often the last stage prior to the work going to the printers. However, it’s certainly an element of editing you should consider prior to sending your work out for consideration, or turning it in to a colleague or professor.
Unlike copy editing, proofreading offers no reflections on structural elements or style. This type of editing looks solely at grammatical issues and consistency. Spelling mistakes and failure to be consistent will get your work rejected instantly, so it’s vital to make certain there aren’t any blatant errors in your project.
This type of editing is particularly useful for academic work and/or articles you need to be error free.