An official letter is a written communication between two parties, often used for business purposes. It can be sent by post or electronically, and is usually composed of formal language and professional format. An official letter serves as an official statement from one party to another, and should include relevant details such as who the sender and recipient are, what the subject matter is, the purpose of the letter, and the request being made (if applicable). By writing in a clear and concise manner, using the right tone and style, an official letter can establish trust and respect between parties, helping ensure successful communication.