When writing a letter, layout and paragraphs are important factors. A writer always addresses an audience, which, of course, means the reader. When someone writes a letter, this relationship between reader and writer becomes less abstract and much more immediate. A letter is often meant for a single person. At GCSE, you will be required to know how to write letters for several purposes, using different styles.
Test your knowledge of this form of writing by trying this English revision quiz.