This document provides guidance on writing informal letters in English. It discusses the typical elements of an informal letter like the address, date, opening, body, closing, and signature. It provides examples of how to address the recipient, common opening and closing phrases, as well as sample complete letters. The body of an informal letter should be personal and adjust to the recipient while stating the reason for writing, providing or requesting information, making requests or promises, apologizing, or giving bad news. P.S. messages can be added after the closing.