Letter format refers to the structured way in which a letter is organized and presented. It typically includes several key components: the sender's address, the date, the recipient's address, a greeting or salutation, the body of the letter, a closing, and the sender's signature. Each part serves a specific purpose, ensuring clarity and professionalism in communication. There are different types of letter formats, such as block format, where all elements are left-aligned, and modified block format, which centers the date and closing. Understanding these formats is essential for effective written communication in both personal and professional contexts.