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What Is an Expository Essay? Definition, Structure and Examples
Quick answer: An expository essay explains a topic clearly and objectively using facts, evidence and examples. Instead of arguing for one side, it informs the reader about how something works, why something happened, or what something means. It usually follows a five-paragraph structure: an introduction with a thesis, three body paragraphs that each explain one main point, and a conclusion.
If you’ve been assigned an expository essay, you might be wondering what makes it different from other essays and how to write one well. The good news is that once you understand the purpose, expository essays are one of the most straightforward types of academic writing.
In this guide, we’ll explain what an expository essay is, the different types, how to choose a topic, how to structure your essay, and how to prepare if you have to write one on an exam. You’ll also find a sample thesis and introduction to help you get started.
What Is an Expository Essay?
The word “expository” comes from “expose,” meaning to explain or set out. An expository essay explains or explores a topic using facts, data and examples, so your reader comes away better informed.
Your job is to investigate the topic, organize the information logically and present it in a clear, balanced way. Unlike an argumentative or persuasive essay, an expository essay doesn’t ask you to convince the reader to agree with you. It asks you to explain.
That doesn’t mean expository essays have no thesis. Your thesis still states your main point, but it tells the reader what you’ll explain, not what they should believe.
Expository vs. Argumentative vs. Persuasive Essays
| Expository | Argumentative | Persuasive | |
|---|---|---|---|
| Goal | Inform and explain | Prove a position with evidence | Convince the reader to agree or act |
| Tone | Neutral and objective | Logical and evidence-based | Can be emotional and personal |
| Thesis | States what you will explain | States your position | States your position or call to action |
| Example | How the Bank of Canada sets interest rates | The Bank of Canada should lower interest rates | Why you should start saving now |
For an overview of every essay type, see our guide to types of essays.
What Is the Main Purpose of an Expository Essay?
Instructors assign expository essays to test how well you understand a topic and how clearly you can explain it. To write one well, you need to research effectively, think critically about what you find, and organize information so it’s easy to follow. It’s a great way to test your comprehension skills.
These skills go well beyond the classroom. Explaining complex information clearly is useful in almost any career, from journalism and business to health care and science.
How Do You Know if an Essay Is Expository?
An essay is expository if its main goal is to explain. Look for prompts that ask you to:
- Explain how something works
- Explain why or how something happened
- Define what something means
- Describe how to do something
- Explain the importance or impact of something
Key words in the prompt, such as explain, describe, define, outline or discuss, are usually a sign you’re writing an expository essay. If the prompt asks you to argue, evaluate or take a position, it’s more likely argumentative.
Types of Expository Essays
Expository writing comes in several forms. The most common are:
- Cause and effect: explains why something happens and what results from it.
- Classification: breaks a broad topic into categories and explains each one.
- Definition: explains the meaning of a term or concept in depth.
- Compare and contrast: explains the similarities and differences between two or more subjects.
- Process: explains how to do something or how something works, step by step.
- Problem and solution: explains a problem and the possible ways to address it.
How to Choose a Topic for Your Expository Essay
If your instructor lets you choose, ask yourself:
- Do I already know something about it? Some background knowledge makes research faster.
- Am I interested in it? You’ll write better about a topic you’re curious about.
- Are there enough credible sources? Make sure you can find reliable books, journal articles or reputable websites.
- Does it fit the course? If you’re unsure, check with your instructor before you start.
Choose a topic narrow enough to explain fully within your word count. “Climate change” is too broad. “How rising ocean temperatures affect coral reefs” is focused enough to explain well.
Examples of Expository Essay Topics
Here are some examples of some expository essay topics you could use, or adapt for your own assignment:
- How compound interest works and why it matters for students
- How the printing press changed Western society in the 1400s
- How the Canadian health care system is funded
- The connection between food and mood
- How the Golden Age of Hollywood shaped modern films
- The main differences between online and in-person learning
- How a bill becomes a law in Canada
- What causes inflation
If your professor assigns the topic, focus on understanding exactly what the prompt is asking you to explain.
What Should an Expository Essay Include?
A strong expository essay includes:
- Solid facts and evidence from credible sources
- A clear, focused thesis statement
- A logical structure, with a smooth flow from introduction to body to conclusion
- Clear explanations that a reader new to the topic can follow
- Proper citations for every source you use
It should avoid:
- Personal opinions and persuasive language
- Unnecessary first person. Expository essays are usually written in the third person, unless your instructor says otherwise.
- Spelling, grammar and punctuation errors
The Outline of an Expository Essay
Most expository essays follow the classic five-paragraph structure:
- Introduction with a thesis statement
- Body paragraph 1
- Body paragraph 2
- Body paragraph 3
- Conclusion
Longer essays simply add more body paragraphs. Just keep to one main idea per paragraph. Our guide to essay outlining can help you plan yours before you start writing.
Introduction and Thesis Statement
Start with an attention-grabbing hook that makes your reader want to know more, such as a surprising fact or a question. Then give a little background on your topic, and end with your thesis statement.
Your thesis acts as a roadmap for your essay. It should state your topic and preview the main points you’ll explain. If you need help writing one, you can always download our e-book, The Official Pocket Guide: Everything You Need to Know About Thesis Statements, or read our guide on how to write a thesis statement.
Sample expository thesis:
“Compound interest helps savings grow faster over time because interest is earned on both the original amount and the interest already added, which makes starting early, saving regularly and choosing the right account especially important for students.”
Sample introduction:
If a first-year student saved just a small amount each month, by graduation the money would have grown by more than they put in. The reason is compound interest, one of the most important ideas in personal finance. Compound interest means earning interest not only on the money you deposit but also on the interest it has already earned. Compound interest helps savings grow faster over time because interest is earned on both the original amount and the interest already added, which makes starting early, saving regularly and choosing the right account especially important for students.
Notice that the thesis explains rather than argues, and it previews the three points the body paragraphs will cover.
Body Paragraphs
Each body paragraph should explain one main point from your thesis. A simple pattern works well:
- Topic sentence: introduce the point the paragraph will explain.
- Evidence: support it with facts, statistics, examples or quotes from credible sources.
- Explanation: show how the evidence supports your point.
- Transition: connect the paragraph to the next one.
Your professor will pay close attention to how well your ideas flow, so use transition words like “in addition,” “as a result” and “for example” to guide your reader.
Conclusion
Your conclusion wraps up the essay. It should:
- Restate your thesis in new words
- Briefly summarize your main points
- Avoid introducing new information
- End with a broader thought, such as why the topic matters
Think of your conclusion as the reverse of your introduction. Your introduction moves from broad to narrow, and your conclusion moves from narrow back to broad. You can learn more about crafting the perfect essay conclusion in our blog.
Avoiding Plagiarism and Using Credible Facts
Because expository essays rely on facts, the quality of your sources matters. Use credible sources like academic journals, books, government websites and reputable news organizations, and double-check any statistics you include.
Cite every fact, quote and idea that isn’t your own. Plagiarism, even when it’s accidental, can lead to serious academic penalties. If your instructor doesn’t specify a citation style, ask. MLA Style, APA Style and Chicago Style are the most common in Canadian colleges and universities. For formatting rules for each, see our guide to essay format.
How to Prepare for an Expository Essay on an Exam
Some instructors include expository essays on exams, where you won’t have time to research. To prepare:
- Take really good notes in class so you have facts and examples ready to use.
- Practise outlining. Pick likely topics from your course and sketch a thesis and three main points for each.
- Explain topics out loud. If you can explain a concept clearly to a friend, you can explain it in writing.
- Plan your time. In a timed essay, spend the first few minutes outlining, most of your time writing, and the last few minutes proofreading.
- Get enough sleep. You’ll think and write more clearly after a good night’s rest than after an all-nighter.
Frequently Asked Questions
What are the 5 parts of an expository essay?
An introduction with a thesis statement, three body paragraphs that each explain one main point, and a conclusion.
Does an expository essay have a thesis?
Yes. The thesis states your topic and previews the main points you’ll explain. Unlike an argumentative thesis, it doesn’t take a side.
Can you use “I” in an expository essay?
Usually not. Expository essays are typically written in the third person to keep the tone objective. Check your instructor’s guidelines, since some assignments allow it.
What’s the difference between an expository and an argumentative essay?
An expository essay explains a topic objectively. An argumentative essay takes a position and uses evidence to prove it.
How long is an expository essay?
It depends on the assignment. In high school and first-year courses, many are around five paragraphs, but longer essays and research papers follow the same structure with more body paragraphs.
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