This document discusses the basic principles of business correspondence. It begins by defining correspondence and providing examples like email, messages, letters, and post. It then covers the style of business correspondence, including the proper format, grammar, word usage, and stylistics. The rest of the document explains the typical parts of a business letter like the letterhead, date line, inside address, salutation, body, complimentary close, signature, and notations. It also gives examples of different types of business letters such as inquiries, claims, transmittals, reservations, appreciation, credit, collections, adjustments, and applications.