expository essay thesis

Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

Expository Essays

Welcome to the Purdue OWL

This page is brought to you by the OWL at Purdue University. When printing this page, you must include the entire legal notice.

Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

The Modes of Discourse—Exposition, Description, Narration, Argumentation (EDNA)—are common paper assignments you may encounter in your writing classes. Although these genres have been criticized by some composition scholars, the Purdue OWL recognizes the wide spread use of these approaches and students’ need to understand and produce them.

What is an expository essay?

The expository essay is a genre of essay that requires the student to investigate an idea, evaluate evidence, expound on the idea, and set forth an argument concerning that idea in a clear and concise manner. This can be accomplished through comparison and contrast, definition, example, the analysis of cause and effect, etc.

Please note : This genre is commonly assigned as a tool for classroom evaluation and is often found in various exam formats.

The structure of the expository essay is held together by the following.

• A clear, concise, and defined thesis statement that occurs in the first paragraph of the essay.

It is essential that this thesis statement be appropriately narrowed to follow the guidelines set forth in the assignment. If the student does not master this portion of the essay, it will be quite difficult to compose an effective or persuasive essay.

• Clear and logical transitions between the introduction, body, and conclusion.

Transitions are the mortar that holds the foundation of the essay together. Without logical progression of thought, the reader is unable to follow the essay’s argument, and the structure will collapse.

• Body paragraphs that include evidential support.

Each paragraph should be limited to the exposition of one general idea. This will allow for clarity and direction throughout the essay. What is more, such conciseness creates an ease of readability for one’s audience. It is important to note that each paragraph in the body of the essay must have some logical connection to the thesis statement in the opening paragraph.

• Evidential support (whether factual, logical, statistical, or anecdotal).

Often times, students are required to write expository essays with little or no preparation; therefore, such essays do not typically allow for a great deal of statistical or factual evidence.

• A bit of creativity!

Though creativity and artfulness are not always associated with essay writing, it is an art form nonetheless. Try not to get stuck on the formulaic nature of expository writing at the expense of writing something interesting. Remember, though you may not be crafting the next great novel, you are attempting to leave a lasting impression on the people evaluating your essay.

• A conclusion that does not simply restate the thesis, but readdresses it in light of the evidence provided.

It is at this point of the essay that students will inevitably begin to struggle. This is the portion of the essay that will leave the most immediate impression on the mind of the reader. Therefore, it must be effective and logical. Do not introduce any new information into the conclusion; rather, synthesize and come to a conclusion concerning the information presented in the body of the essay.

A complete argument

Perhaps it is helpful to think of an essay in terms of a conversation or debate with a classmate. If I were to discuss the cause of the Great Depression and its current effect on those who lived through the tumultuous time, there would be a beginning, middle, and end to the conversation. In fact, if I were to end the exposition in the middle of my second point, questions would arise concerning the current effects on those who lived through the Depression. Therefore, the expository essay must be complete, and logically so, leaving no doubt as to its intent or argument.

The five-paragraph Essay

A common method for writing an expository essay is the five-paragraph approach. This is, however, by no means the only formula for writing such essays. If it sounds straightforward, that is because it is; in fact, the method consists of:

• an introductory paragraph
• three evidentiary body paragraphs
• a conclusion

Home / Guides / Writing Guides / Paper Types / How to Write an Expository Essay

How to Write an Expository Essay

Every student has to write an expository essay at least once in their educational career. These are actually fairly simple essays to write, but they do require some serious research skills. Like most academic essays, the expository essay requires formal writing with an introduction, body, and conclusion.

Guide Overview

• Focus on the thesis
• Listen to the assignment
• Explain, don’t argue
• Revise and edit, revise and edit
• Choosing the right topic

Tips for Writing a Kick-Butt Essay

Want to really impress your professor? Here are a few ways you can turn an ordinary essay into something that will blow their socks off.

Focus on the Thesis

Your thesis is the central point of the entire essay, so if it’s amazing, you’re off to a great start. Begin with this and make sure you decide on something that is impressive to kick off the essay.

Listen to the Assignment

Your professor may give you hints on what they’re looking for. If you just write down the basics of the assignment, you could miss out on some key points. For example, your professor may hint at a preferred topic or give tips that could result in a higher score. Write it all down and then analyze what is wanted before you write.

Long before you actually put pen to paper or fingers to keyboard to write the essay, you need to complete the pre-writing phase. This is where you do research and outline your essay. You’ll be amazed at how much better your writing is when you have these basic elements in place first. If you need help with these basic elements consider using an Expository Essay Template.

Explain, Don’t Argue

If you’re not careful, an expository essay can turn into a persuasive or argumentative essay. Focus on explaining the topic, rather than convincing people of something about it.

Revise and Edit, Revise and Edit

Going over the essay once to edit and polish isn’t really enough. If you’re tight on time, such as when writing an essay for an exam, just once will do. However, if you have time, it’s a good idea to edit immediately, then let the essay sit overnight or even longer. When you come back, you won’t be as close to the writing and can look at it more objectively.

Choosing the Right Topic

Topics for an expository essay vary widely, but ideally, you should select something you’re interested in writing about. Topics can answer a question such as “How can we prevent bullying in school?” or they can describe something like a historical building in your area. Other interesting topics to inspire you include:

• How does technology affect our relationships?
• How to treat a burn
• What are the must-haves for a freshman in college?
• How to handle anxiety attacks naturally
• How to train your dog to stop barking on command
• Research the history of a monument in your area
• Why roller skating is a great exercise

As you can see, there’s no limit to the types of topics you can choose for your essay and it really comes down to what the professor assigns you and what you enjoy writing about. How narrow your topic is will also depend on how much you plan to write. An entire history of the Civil War won’t fit into two page, for example, so you’ll need to narrow it down to a specific battle or element of the Civil War.

Writing an expository essay can actually be a fun experience if you approach it the right way. When you enjoy the topic and are interested in it, your essay will show that and will stand out from those written out of boredom.

Finally, if you’re ever facing writer’s block for your college paper, consider WriteWell Essay Templates to help you get started.

EasyBib Writing Resources

Writing a paper.

• Academic Essay
• Argumentative Essay
• College Admissions Essay
• Expository Essay
• Persuasive Essay
• Research Paper
• Thesis Statement
• Writing a Conclusion
• Writing an Introduction
• Writing an Outline
• Writing a Summary

EasyBib Plus Features

• Citation Generator
• Essay Checker
• Expert Check Proofreader
• Grammar Checker
• Paraphrasing Tools

Plagiarism Checker

• Spell Checker

How useful was this post?

Click on a star to rate it!

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Grammar and Plagiarism Checkers

Grammar Basics

Plagiarism Basics

Writing Basics

Upload a paper to check for plagiarism against billions of sources and get advanced writing suggestions for clarity and style.

Get Started

Want to create or adapt books like this? Learn more about how Pressbooks supports open publishing practices.

Chapter 4: What Are You Writing, to Whom, and How?

4.1 Expository Essays

Learning Objectives

• Understand the function and use of expository essays
• Identify eight types of expository essays
• Apply expository essay structure

What Is an Expository Essay?

An essay that explains a writer’s ideas by defining, explaining, informing, or elaborating on points to allow the reader to clearly understand the concept.

Many of your future academic workplace writing assignments will be expository–explaining your ideas or the significance of a concept or action. An expository essay allows the writer the opportunity to explain his or her ideas about a topic and to provide clarity for the reader by using:

• Explanations
• Definitions

It may also include the writer outlining steps of a procedure in a way that is straightforward for the reader to follow. It is purely informative and often contains elements of summary.

Imagine you need to verbally explain a concept to your classmates, maybe a behavioural theory. What are the key elements on which you would focus? How would you organize the information? You could explain who came up with the theory, the specific area of study to which it is related, its purpose, and the significant details to explain the theory. Telling these four elements to your classmates would give them a complete, yet summarized, picture of the theory, so they could apply the theory in future discussions.

Although you did this verbally, you were still fulfilling the elements of an expository essay by providing definition, details, explanations, and maybe even facts if you have a really good memory. This is the same process that you would use when you write an expository essay. You may actually be doing this all the time; for example, when you are giving someone directions to a place or explaining how to cook something. In the following sections of the chapter, you will practise doing this more in different expository written forms.

The Structure of an Expository Essay

Sections versus paragraphs.

Before looking at the general structure of an expository essay, you first need to know that in your post-secondary education, you should not consider your essay as writing being constructed with five paragraphs as you might have been used to in high school. You should instead think of your essay in terms of sections (there may be five), and each section may have multiple paragraphs.

To understand further why you need to think beyond the five-paragraph essay, imagine you have been asked to submit a six-page paper (approximately 1,500 words). You already know that each paragraph should be roughly 75 to 200 words long. If you divide the required word count by five paragraphs (1,500 by 5), you end with 300 words per paragraph, way above the number you should have in a paragraph. If your paragraphs are too long, they likely have too many ideas and your reader may become confused. Your paragraphs should be two-third of a page at most, and never longer than a page.

Instead, if you think of your essays being divided into sections (with possibly more than one paragraph per section), your writing will likely be more organized and allow your reader to follow your presentation of ideas without creating too much distance between your paragraph’s supporting points and its topic sentence.

As you will see in Section 4.5: Classification , some essay forms may require even more than five paragraphs or sections because of how many points are necessary to address. . For the rest of this chapter, the term paragraph will also imply section.

Sections of an Expository Essay

An expository essay, regardless of its purpose, should have at least five sections, which are:

• Introduction
• First body section/paragraph
• Second body section/paragraph
• Third body section/paragraph

The introduction should state the topic of your paper: your thesis statement as well as brief signposts of what information the rest of the paper will include. That is, you only want to mention the content of the body paragraphs; you do not want to go in to a lot of detail and repeat what will be in the rest of the essay.

The first body section or paragraph should focus on one of your main points and provide evidence to support that point. There should be two to three supporting points: reasons, facts, statistics, quotations, examples, or a mix of these. Both the second and third body sections should follow the same pattern. Providing three body sections with one point each that supports the thesis should provide the reader with enough detail to be convinced of your argument or fully understand the concept you are explaining. However, remember that some sections will require more explanation, and you may need to separate this information into multiple paragraphs.

You can order your sections in the most logical way to explain your ideas. For example, if you are describing a process, you may use chronological order to show the definite time order in which the steps need to happen. You will learn about the different ways to organize your body paragraphs in the next chapter.

The concluding paragraph , or conclusion, can be a little tricky to compose because you need to make sure you give a concise summary of the body paragraphs, but you must be careful not to simply repeat what you have already written. Look back at the main idea of each section/paragraph, and try to summarize the point using words different from those you have already used. Do not include any new points in your concluding paragraph.

Consider Your Audience: How Much Do They Know?

Later in this chapter, you will work on determining and adapting to your audience when writing, but with an expository essay, since you are defining or informing your audience on a certain topic, you need to evaluate how much your audience knows about that topic (aside from having general common knowledge). You want to make sure you are giving thorough, comprehensive, and clear explanations on the topic. Never assume the reader knows everything about your topic (even if it is covered in the reader’s field of study). For example, even though some of your instructors may teach criminology, they may have specialized in different areas from the one about which you are writing; they most likely have a strong understanding of the concepts but may not recall all the small details on the topic. If your instructor specialized in crime mapping and data analysis for example, he or she may not have a strong recollection of specific criminological theories related to other areas of study. Providing enough background information without being too detailed is a fine balance, but you always want to ensure you have no gaps in the information, so your reader will not have to guess your intention. Again, we will practise this more in Section 4.10: Purpose, Audience, Tone, and Content .

What Comes Next?

In the next eight sections (4.2 through 4.9), we will look at different expository modes, or rhetorical modes, you will often be assigned.

H5P: Let’s take a moment to see how much you already know about types of Expository Essays. Match the type of Expository Essay to the most correct description.

Descriptions:

• the art of storytelling
• to show or demonstrate something clearly
• writing that appeals to our senses
• to break down broad subjects into smaller parts
• to explain how to do something or how something works
• establish the way in which people communicate ideas
• analyze two subjects in relation to each other
• to determine how various phenomena relate

Expository Essay Type:

• Process analysis
• Illustration
• Compare and contrast
• Description
• Cause and effect
• Classification

Answer Key:

Rhetorical modes refers simply to the ways to communicate effectively through language. As you read about these modes, keep in mind that the rhetorical mode a writer chooses depends on his or her purpose for writing. Sometimes writers incorporate a variety of modes in any one essay. In this chapter, we also emphasize the rhetorical modes as a set of tools that will allow you greater flexibility and effectiveness in communicating with your audience and expressing your ideas.

In a few weeks, you will need to submit your first essay–an expository sample–and you will be given the choice of topic: one from each of the modes. Think about which types of expository essays are easier and which are more challenging for you. As mentioned, as you progress through your studies, you will be exposed to each of these types. You may want to explore a mode you find more challenging than the others in order to ensure you have a full grasp on developing each type. However, it is up to you. As you work through the sections, think about possible topics you may like to cover in your expository essay and start brainstorming as you work through the self-practice exercises.

After we explore each of the individual modes in the eight sections that follow, we will look at outlining and drafting; it is at this point you will want to fine tune and narrow the topic you will write about, so you can focus on that when doing the exercises.

Writing for Success - 1st Canadian H5P Edition by Tara Horkoff is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License , except where otherwise noted.

Share This Book