Business letters are formal written communications used to share ideas, promote products or events, complain to or support officials/businesses, ask for help, contact organizations, gain internships, help solve problems, express thanks, introduce oneself, recommend, formalize agreements, or request something. The document provides guidelines for organizing and writing business letters, including using the standard format, formal language, conciseness, clarity of purpose, and attention to formatting details like font, spacing, spelling, grammar, and trifolding. It outlines the typical anatomy of a business letter, including sender's address, date, recipient's address, salutation, single-spaced body in multiple paragraphs, closing, signature, and optional enclosures/copies.