The document discusses the format and elements of business letters. A business letter is a formal letter written on company letterhead that uses a specific format including the letterhead, date, recipient's address, salutation, multiple paragraph body, closing, sender's name and title, and margins. A personal business letter is similar but does not use letterhead and includes the individual's home address above the date. Common business letter formats include full block with open or mixed punctuation and modified block with open or mixed punctuation, with full block being the most commonly used style.