Rhetorical modes (also known as modes of discourse) describe the variety, conventions, and purposes of the major kinds of writing. Four of the most common rhetorical modes and their purpose are exposition, argumentation, description, and narration.
The purpose of exposition (or expository writing) is to explain and analyze information by presenting an idea, relevant evidence, and appropriate discussion. Examples include:
- Business letters
- How-to essays, such as recipes and other instructions
- News stories
- Personal letters
- Press releases
- Scientific reports
- Term papers
- Encyclopedia articles
The purpose of argumentation (also called persuasive writing) is to prove the validity of an idea, or point of view, by presenting sound reasoning, discussion, and argument that thoroughly convince the reader. Persuasive writing is a type of argumentation with the additional aim to urge the reader to take some form of action. Examples include:
- Advertising copy
- Critical review
- Job evaluation
- Job application letter
- Letter of recommendation
- Letters to the editor
Another form of persuasive rhetoric is satirical rhetoric, or using humor in order to make a point about some aspect of life or society. Perhaps the most famous example is Jonathan Swift's "A Modest Proposal."
The purpose of description is to re-create, invent, or visually present a person, place, event, or action so that the reader can picture that which is being described. Descriptive writing can be found in the other rhetorical modes. Examples include:
The purpose of narration is to tell a story or narrate an event or series of events. This writing mode frequently uses the tools of descriptive writing. Narration is an especially useful tool for sequencing or putting details and information into some kind of logical order, usually chronological. Working with narration helps us see clear sequences separate from all other mental functions. Examples include:
Fiction-writing modes 
Each fiction-writing mode has its own purposes and conventions. Agent and author Evan Marshall identifies five fiction-writing modes: action, summary, dialogue, feelings/thoughts, and background (Marshall 1988, pp. 143–165). Author and writing-instructor Jessica Page Morrell lists six delivery modes for fiction-writing: action, exposition, description, dialogue, summary, and transition (Morrell 2006, p. 127). Author Peter Selgin refers to methods, including action, dialogue, thoughts, summary, scene, and description (Selgin 2007, p. 38).
See also 
- Exposition (literary technique)
- Expository writing
- Fiction writing
- Fiction-writing modes
- Rosakis LE (2003). Complete Idiot's Guide to Grammar and Style 2E (The Complete Idiot's Guide). Indianapolis, IN: Alpha. ISBN 1-59257-115-8.
- Marshall, E (1998). The Marshall Plan for Novel Writing. Cincinnati, OH: Writer's Digest Books. pp. 143–165. ISBN 1-58297-062-9.
- Morrell, JP (2006). Between the Lines: Master the Subtle Elements of Fiction Writing. Cincinnati, OH: Writer's Digest Books. p. 127. ISBN 978-1-58297-393-7.
- Selgin, P (2007). By Cunning & Craft: Sound Advice and Practical Wisdom for fiction writers. Cincinnati, OH: Writer's Digest Books. p. 38. ISBN 978-1-58297-491-0.