This document discusses different methods of written communication used in business, including memos, faxes, and emails. Memos are short internal documents that provide information and request actions, and have a standardized format including a heading with date, recipients, author, and subject. Faxes can transmit full letters or short messages like memos. Email is used for both internal and external communication, and should follow etiquette or "netiquette" guidelines like being concise, using a clear subject line, and avoiding all capital letters or excessive punctuation. The document provides tips for properly writing memos, faxes, and emails in a business or professional context.