This document provides information about formal and informal letter writing. It discusses the key differences between formal and informal letters, including their purpose, format, and examples. For formal letters, it outlines the standard format which includes sender's address, date, recipient's address, subject line, salutation, 3 paragraph body, complimentary closing, name, and signature. Sample formal letters include an application letter to a bank manager requesting an ATM card. For informal letters, the format is more flexible and examples given are a congratulatory letter to a friend who passed their university exam.