This document provides guidance on proper business correspondence etiquette, including how to address the recipient, reference the reason for writing, request or provide information, close the letter, and include a sample business letter confirming an order. Key points covered are using "Dear" followed by the recipient's title and name if known, referencing the reason for contact such as a previous letter or call, using polite language like "could you" or "I would be grateful if" for requests, thanking the recipient for their help, and closing with "yours sincerely" or "best regards".