This document provides guidance on various types of business letters. It discusses the purpose and key components of sales letters, claim letters, adjustment letters, collection letters, enquiry letters, quotation letters, and job application letters. For each letter type, the document outlines the main purpose and recommends elements to include, such as getting the reader's attention in a sales letter or clearly explaining the issue in a claim letter. The document also reviews the typical sections of a business letter, such as the heading, date line, salutation, body, complimentary closing, and signature.