Letter structure refers to the organized format used when writing a letter. It typically includes several key components: the sender's address, date, recipient's address, greeting, body, closing, and signature. Each part serves a specific purpose, helping to convey the message clearly and professionally. The body of the letter is where the main content resides, often divided into paragraphs for better readability. The closing and signature provide a polite end to the correspondence, indicating who the letter is from. Following a proper letter structure ensures effective communication and enhances the overall presentation of the message.