This document provides information on writing a business letter, including its purpose, structure, and components. A business letter is a formal letter used for communication between businesses or organizations. It includes elements such as the letterhead, sender's address, date, inside address of the recipient, salutation, body, complimentary close, signature, and type of business letter (e.g. inquiry, order, refusal). The document outlines the format and layout of each component and provides examples. It also discusses applying the "seven C's of communication" to business letters, which are completeness, conciseness, consideration, concreteness, clarity, courtesy, and correctness.