This document provides guidance on how to write a formal letter. It explains that a formal letter is usually written to people you don't know, for purposes like complaining, applying for a job, or responding to a formal letter. The style should be not personal and provide information clearly and concisely without contractions. A formal letter has an introduction, main body, and conclusion. It recommends brainstorming ideas and planning the structure before writing the introduction, main body paragraphs, and conclusion paragraph. The document also provides examples of greetings and endings to use in a formal letter.