The difference between by and through may seem small, but choosing the right one can make your writing clearer and more natural.
Both words can describe how something happens, yet they are not interchangeable in every situation. In some sentences, by emphasizes the method or means, while through highlights the process, channel, or experience that leads to a result.
This distinction matters in everyday conversations, business communication, academic writing, and professional documents.
Using the wrong preposition can subtly change your meaning or make your sentence sound awkward to native English speakers.
In this guide, you’ll learn exactly how by and through differ, when each one is the better choice, common mistakes to avoid, and plenty of real-world examples to help you use both with confidence.
Quick Answer
Both by and through are correct, but they are used differently.
- Use by when you want to show the method, means, or agent that causes something.
- Use through when you want to emphasize the process, medium, channel, or experience that leads to a result.
Example:
- She sent the documents by email. ✅ (method)
- We solved the problem through teamwork. ✅ (process)
Although both can sometimes express how something happens, they focus on different ideas.
By vs Through Comparison Table
| Feature | By | Through |
|---|---|---|
| Part of Speech | Preposition | Preposition |
| Main Meaning | Means, method, agent, proximity | Process, channel, path, experience |
| Focus | How something is done | How something is achieved |
| Common Use | Transportation, communication, passive voice, measurements | Improvement, change, communication channels, movement |
| Formality | Neutral | Neutral |
| Everyday English | Very common | Very common |
| Academic Writing | Frequently used | Frequently used |
| Business Writing | Frequently used | Frequently used |
| Passive Voice | Yes | Rarely |
| Indicates a Process | Sometimes | Yes |
| Indicates an Agent | Yes | No |
| Physical Movement | Yes | Yes |
| Abstract Ideas | Yes | Yes |
| Common Mistake | Using it instead of “through” for a process | Using it instead of “by” for a simple method |
| Easy Reminder | Think method | Think journey or process |
| US English | Standard | Standard |
| UK English | Standard | Standard |
What Does By Mean?
By is one of the most common prepositions in English. Its core idea is means, method, agent, or proximity. It answers questions such as How?, Who did it?, or What method was used?
Instead of focusing on a long process, by usually points to the direct way something happens.
Core Meaning
The central meaning of by is using something as the means to achieve a result.
Examples:
- By vs Through
- She paid by credit card.
- The report was written by Sarah.
- By vs Through
In each sentence, by tells us the method, means, or person responsible.
Origin
The word by comes from Old English bī, meaning near, beside, or close to. Over time, its meaning expanded to include methods, agency, measurement, and manner.
Today, it remains one of the most versatile prepositions in English.
Grammar
By functions as a preposition.
It is commonly followed by:
- By vs Through
- A pronoun
- A noun phrase
- By vs Through
Examples:
- by car
- By vs Through
- by mistake
- by working hard
Pronunciation
By is pronounced:
/baɪ/
It rhymes with:
- sky
- By vs Through
- try
When to Use By
Use by when talking about:
Method
- by email
- By vs Through
- by bicycle
Example:
Please send the contract by email.
Transportation
Examples:
- By vs Through
- by train
- by plane
- By vs Through
Example:
We usually travel by train.
The Person Performing an Action
This is especially common in passive sentences.
Examples:
- By vs Through
- designed by
- painted by
Example:
The novel was written by a famous author.
Measurements
Examples:
- increase by 20%
- reduce by half
- By vs Through
Example:
Sales increased by 15% last month.
Deadlines
Examples:
- By vs Through
- by tomorrow
- by noon
Example:
Please submit your assignment by Friday.
Professional Use
In business writing, by commonly introduces:
- communication methods
- deadlines
- By vs Through
- measurable changes
Examples:
- Reply by email.
- By vs Through
- The proposal was prepared by the finance team.
Academic Use
Academic writing frequently uses by to identify researchers, authors, and methods.
Examples:
- The experiment was conducted by university researchers.
- By vs Through
Everyday Use
In daily conversations, by appears naturally in countless expressions.
Examples:
- By vs Through
- by accident
- by chance
- by hand
- By vs Through
- by now
Example:
I learned the poem by heart.
Common Collocations with By
Some of the most natural combinations include:
- By vs Through
- by chance
- by mistake
- by design
- by hand
- by air
- by sea
- by road
- By vs Through
- by phone
- by law
- by force
- by yourself
- By vs Through
- by then
- by now
These combinations are fixed expressions that native speakers use regularly.
Tip
Think of by as answering this question:
“What method, means, person, or measurement made this happen?”
If you can answer that question, by is often the correct choice.
What Does Through Mean?
Unlike by, which focuses on the method or means, through emphasizes passing within something, moving across it, or achieving a result because of a process, experience, or channel.
The central idea behind through is movement, progression, or completion.
Core Meaning
Through often suggests that something happens along a path or over the course of a process before reaching a final outcome.
Examples:
- By vs Through
- She learned English through practice.
- They met through mutual friends.
In each example, success or connection comes from an ongoing process or channel rather than a simple method.
Origin
Through comes from Old English þurh, meaning from one side to the other, across, or within. Its original sense of movement gradually expanded to include figurative ideas such as achieving results through effort, experience, or relationships.
Grammar
Like by, through is a preposition.
It is usually followed by:
- By vs Through
- a noun phrase
- a pronoun
Examples:
- By vs Through
- through experience
- through education
- through teamwork
Pronunciation
Through is pronounced:
/θruː/
The th sound is the same as in think, followed by a long oo sound.
When to Use Through
Use through when talking about:
A Process
Examples:
- By vs Through
- through learning
- through negotiation
Example:
She became fluent through daily practice.
A Channel or Medium
Examples:
- By vs Through
- through a website
- By vs Through
- through social media
Example:
I found this job through LinkedIn.
Physical Movement
Examples:
- through the tunnel
- through the forest
- through the door
- through the crowd
Example:
We walked through the park before sunset.
Experience or Difficulty
Examples:
- through difficult times
- By vs Through
- through challenges
Example:
They stayed together through many challenges.
Professional Use
In workplace communication, through often highlights collaboration, systems, or organizational processes.
Examples:
- By vs Through
- Customer feedback was collected through online surveys.
- The issue was resolved through cooperation between departments.
Academic Use
Academic writing frequently uses through to describe research methods, learning processes, and causal relationships.
Examples:
- Knowledge develops through observation and experimentation.
- By vs Through
Everyday Use
In daily English, through is common when describing experiences, relationships, and progress.
Examples:
- By vs Through
- through hard work
- through friendship
- By vs Through
- through persistence
Example:
He gained confidence through experience.
Common Collocations with Through
Some of the most common combinations include:
- through practice
- By vs Through
- through education
- through research
- through discussion
- through negotiation
- through teamwork
- through effort
- By vs Through
- through communication
- through technology
- through mutual friends
- through the window
- through the tunnel
- By vs Through
Tip
Think of through as answering this question:
“What process, channel, path, or experience led to this result?”
If the sentence emphasizes a journey, development, or progression rather than a simple method, through is usually the better choice.
By vs Through: Key Differences
Although by and through can both explain how something happens, they emphasize different ideas. Understanding this distinction will help you choose the most natural preposition in every situation.
Use by when the focus is on the method or means.
- Send it by email.
- Travel by train.
- Pay by credit card.
- Written by Shakespeare.
In each example, by tells you how something was done or who did it.
Use through when the focus is on the process, channel, or experience.
- Learn English through practice.
- Solve the problem through teamwork.
- Get customers through referrals.
- Improve skills through experience.
Here, through shows that the result came after a process or by using a particular channel.
Sometimes Both Are Possible—but the Meaning Changes
There are situations where both by and through are grammatically correct, but they highlight different aspects of the same event.
Example 1
- She found the job by a friend’s recommendation.
- She found the job through a friend’s recommendation.
The second sentence sounds more natural because it emphasizes the recommendation as the channel that led to the job.
Example 2
- We solved the issue by talking openly.
- We solved the issue through open communication.
The first sentence focuses on the action taken.
The second focuses on the overall process.
Example 3
- He became successful by working hard.
- He became successful through hard work.
Both are correct.
The first emphasizes the action.
The second emphasizes the journey and sustained effort.
Grammar Explanation
Understanding the grammar behind by and through makes it much easier to choose the right one.
Parts of Speech
Both by and through are prepositions.
A preposition connects a noun or noun phrase to another part of the sentence and often shows relationships such as method, direction, cause, place, or time.
Examples:
- by bus
- by mistake
- through the forest
- through experience
Method vs. Process
This is the biggest grammatical difference.
Use by for:
- method
- means
- tool
- agent
Examples:
- by email
- by phone
- by hand
- by bicycle
Use through for:
- process
- channel
- pathway
- experience
Examples:
- through research
- through teamwork
- through practice
- through discussion
Passive Voice
By is the standard preposition for introducing the person or thing performing the action in passive sentences.
Examples:
- The report was written by Maria.
- The bridge was designed by an experienced engineer.
- The painting was created by a local artist.
Using through here is incorrect.
❌ The report was written through Maria.
✅ The report was written by Maria.
Movement
Both prepositions can relate to movement, but they describe different ideas.
By often means beside, past, or near.
Examples:
- We walked by the river.
- She stood by the door.
Through means moving from one side to another inside something.
Examples:
- We walked through the forest.
- The train passed through the tunnel.
Cause and Achievement
Sometimes both words explain how something happened.
Compare these examples:
By
Success came by making better decisions.
Focus: the action.
Through
Success came through years of dedication.
Focus: the process.
Business Writing
Business English uses both prepositions regularly.
Use by for methods.
Examples:
- Contact us by email.
- Pay by bank transfer.
- Submit the report by Friday.
Use through for systems and channels.
Examples:
- Sales increased through digital marketing.
- Customers contacted us through the website.
- We hired employees through an agency.
Academic Writing
Academic English often distinguishes between direct methods and broader processes.
Examples with by
- The results were calculated by computer software.
- The survey was conducted by researchers.
Examples with through
- Knowledge develops through observation.
- Students improve through repeated practice.
Formal and Informal English
Neither by nor through is more formal than the other.
Both appear naturally in:
- everyday conversations
- business reports
- academic journals
- government publications
- newspapers
The choice depends on meaning, not formality.
British and American English
There is no significant difference between American English and British English.
Both varieties use by and through in the same way.
Real-Life Examples
Below are original examples showing how native speakers naturally use by and through in different situations.
Everyday Conversation
- I usually go to work by bus.
- She learned cooking through practice.
- We met through mutual friends.
- He paid by card.
- They became close through shared experiences.
At School
- Students improve their vocabulary through daily reading.
- The assignment must be submitted by Monday.
- The teacher explained the lesson through practical activities.
- The answer was discovered by careful observation.
Business English
- Please send your invoice by email.
- The company expanded through strategic partnerships.
- We solved the issue through collaboration.
- Payments can be made by bank transfer.
- New customers came through referrals.
Professional Writing
- The software was developed by experienced engineers.
- Productivity increased through automation.
- The report was approved by management.
Academic Writing
- Researchers collected the data through field interviews.
- The theory was introduced by the author.
- Students gain confidence through regular practice.
Text Messages
- I’ll send the photos by WhatsApp.
- I heard about the event through Instagram.
Social Media
- She built her audience through consistent content.
- I discovered this page through a friend’s post.
Daily Speaking
- We succeeded through teamwork.
- He learned everything by watching his father.
- They entered through the back gate.
- Please contact me by phone.
- The child learned through play.
- She earned respect through honesty and dedication.
Common Mistakes
Mistake 1
❌ I contacted him through email.
Why it’s incorrect:
When referring to the communication method, English normally uses by email.
✅ I contacted him by email.
Mistake 2
❌ The book was written through Charles Dickens.
Why it’s incorrect:
Passive voice requires by to identify the author.
✅ The book was written by Charles Dickens.
Mistake 3
❌ We improved the project by teamwork.
Why it’s incorrect:
Teamwork describes the process rather than the method.
✅ We improved the project through teamwork.
Mistake 4
❌ The train went by the tunnel.
Why it’s incorrect:
This means the train passed beside the tunnel.
If it entered the tunnel, use through.
✅ The train went through the tunnel.
Mistake 5
❌ I found this job by LinkedIn.
Why it’s incorrect:
LinkedIn is the channel through which the opportunity was found.
✅ I found this job through LinkedIn.
Mistake 6
❌ She became fluent by experience.
Why it’s incorrect:
Experience is an ongoing process.
✅ She became fluent through experience.
Mistake 7
❌ We communicated through phone.
Why it’s incorrect:
The standard expression is by phone.
✅ We communicated by phone.
Memory Tricks
Remember By = Method
Think:
By = How did you do it?
Examples:
- by car
- by train
- by email
- by phone
- by hand
If the answer is a direct method or means, choose by.
Remember Through = Journey
Think:
Through = What process or path led to the result?
Examples:
- through practice
- through teamwork
- through education
- through experience
- through research
If the idea involves progress, development, or a channel, choose through.
One Simple Rule
Ask yourself:
- Is it the method? → by
- Is it the process or pathway? → through
This simple question will help you choose the correct preposition in most situations.
Quick Summary
Use by for the means, method, agent, or direct way something happens.
Use through for the process, channel, journey, or experience that leads to a result.
FAQs
Is by or through correct?
Both are correct, but they are not interchangeable. Use by to describe a method, means, or agent, and use through to describe a process, channel, or path that leads to a result.
Examples:
- I paid by credit card. ✅
- We succeeded through hard work. ✅
What is the main difference between by and through?
The simplest difference is this:
- By answers “How was it done?”
- Through answers “What process or channel led to it?”
Compare these examples:
- She sent the package by courier. (method)
- She found the courier through a friend’s recommendation. (channel)
Can by and through be used interchangeably?
Sometimes, but not always.
In a few sentences, either preposition is grammatically correct, although the emphasis changes.
Example:
- He became successful by working hard.
- He became successful through hard work.
The first sentence highlights the action. The second emphasizes the overall process and sustained effort.
Is it by email or through email?
The standard and most natural expression is:
✅ by email
Examples:
- Please send the invoice by email.
- I received the documents by email.
Although through email may occasionally appear when emphasizing email as a communication channel, by email is the preferred choice in everyday, business, and academic English.
Is it by phone or through phone?
Use:
✅ by phone
Examples:
- We discussed the project by phone.
- I’ll contact you by phone tomorrow.
Through phone is not natural in standard English.
Is it through hard work or by hard work?
The more natural expression is:
✅ through hard work
Hard work represents an ongoing process that leads to success.
Example:
She achieved her goals through hard work and determination.
You may also see by working hard, where the focus is on the action rather than the process.
Is it by experience or through experience?
Use:
✅ through experience
Examples:
- We learn through experience.
- Wisdom comes through experience.
Experience is viewed as a process, making through the natural choice.
Is it by teamwork or through teamwork?
The correct expression is:
✅ through teamwork
Examples:
- We completed the project through teamwork.
- Success was achieved through teamwork and communication.
Teamwork is an ongoing collaborative process, not simply a method.
Is through more formal than by?
No.
Both prepositions are common in:
- Everyday conversations
- Business communication
- Academic writing
- Professional reports
- Formal documents
Your choice depends on the meaning you want to express—not on the level of formality.
People Also Ask
When should I use by instead of through?
Use by when referring to a method, means, transport, communication method, deadline, measurement, or the person performing an action.
When should I use through instead of by?
Use through when emphasizing a process, journey, channel, relationship, experience, or movement from one point to another.
Can through replace by in passive voice?
No.
Passive voice requires by to introduce the agent.
✅ The report was written by Emma.
❌ The report was written through Emma.
Why do native speakers say by email instead of through email?
Because email is treated as the method of communication rather than a process. English naturally pairs communication methods with by.
Is through always about movement?
No.
While through often describes physical movement, it also expresses figurative ideas such as learning, development, communication, relationships, and progress.
Which preposition is more common?
Both are extremely common, but by appears more frequently because it has a wider range of grammatical uses, including transportation, passive voice, communication methods, measurements, and deadlines.
Conclusion
Choosing between by and through is not about finding a single “correct” word. Both are standard English prepositions, but they express different relationships.
Use by when you want to emphasize the method, means, agent, transportation, communication method, deadline, or measurement. It answers the question, “How was it done?” or “Who did it?”
Use through when you want to highlight the process, pathway, channel, experience, or journey that leads to an outcome. It answers the question, “What process or route made this possible?”
As a quick rule:
- Method or means → by
- Process or pathway → through
Remembering this distinction will help you write more naturally and accurately in everyday conversations, professional emails, academic papers, and business communication.
I am Julian Brooks, an English language enthusiast and content writer at EnglishAcademy. I create clear grammar lessons, vocabulary guides, and writing tips to help learners improve their English with confidence every day.