The document provides information about writing an informal letter, including reasons for writing one such as to convey information, make requests or invitations. It outlines the typical format of an informal letter, including the heading with address, date, greeting, body with introduction and main content, conclusion and farewell, and closing with signature. An example of an informal letter is given thanking an aunt for a gift and looking forward to seeing her. Finally, an exercise is suggested to write a letter to a friend's depressed brother giving tips on managing stress such as managing time, relaxing, and sharing problems.