In word processing, previewing refers to formatting a document for the printer, but then displaying it on the display screen instead of printing it. Previewing allows you to see exactly how the document will appear when printed. If you have a WYSIWYG, previewing is unnecessary because the display screen always resembles the printed version. For word processors that are not WYSIWYGs, however, previewing is the next-best thing. If your word processor does not support previewing, you may be able to buy a separate program that allows you to preview documents.