The document summarizes the key aspects of business letters, including their definition, objectives, characteristics, parts, formats, and differences between American and British styles. A business letter is a formal written communication between businesses or organizations used to exchange business information. It aims to build goodwill and maintain business relationships. Business letters are characterized by simplicity, clarity, and courtesy and follow standardized formats and parts like a letterhead, date, greeting, body, complimentary close, and signature.