This document provides guidance on writing business letters, including their typical structure and components. It discusses the header, date, inside address, salutation, body, complimentary close, signature, and other standard elements. Guidelines are given for different types of letters depending on whether they contain good, neutral, or bad news. Tips are also provided, such as using a clear and professional tone, and proofreading before sending. The overall structure and purpose of a business letter is to communicate formally and effectively between organizations.