Most people don’t know the difference between proofreading and editing, but these services are very different. For example, they should be done at different times in the publishing process, they work with different kinds of files, and their scope of work is vastly different. If you’re unsure which one you need, read below to find out the difference between proofreading and editing.

Proofreading is for last-minute touch-ups before publishing.

Some things a proofreader might look for are errors in punctuation, grammar, spelling, and simple formatting. They’ll make sure all the cross-references that say, “See page X for more information about this,” actually line up and have the correct page number. They’ll make sure a chapter number isn’t skipped or duplicated, that words aren’t cut off by graphics, that the pages look nice and clean. All the little details that you don’t really want to take the time to check are important, that’s what a proofreader will do for you—in addition to checking for typos, punctuation errors, and inconsistent grammar.

Introductions are a crucial part of most nonfiction books (and some fiction books). Introductions talk about the subject material and give the reader any background information they may need before diving into the book. This way, you can start chapter one with the actual chapter one content rather than explaining terms and concepts in chapter one needed throughout the entire book.