Copywriting: Reason Why
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Definition and Structure of the Reason Why
The reason why is the real, credible explanation for why an advertising promise should be true.
In other words, it creates a bridge between what you promise and the reason the reader should believe you.
Imagine you're selling a moisturizer and you write: "Keeps skin hydrated for up to 24 hours."
That's a promise, and on its own, it isn't enough, because the reader will wonder: "Why should I believe you? Who can assure me that what you're saying is true?"
If you're not a well-known brand with a long history and a large number of verifiable testimonials, you can't expect someone to believe your promise just because you wrote it on your website.
This is exactly where the reason why comes in.
For the example I just gave you, a credible reason why might be:
Keeps skin hydrated for up to 24 hours thanks to a formula containing hyaluronic acid. This substance helps retain water in the surface layers of the skin. Here you can review the scientific studies explaining this mechanism: X.
Now you've explained to the reader why what you're saying should be possible.
The structure to use is:
Feature/Mechanism ➡️ Reason Why ➡️ Benefit ➡️ Link to an Authoritative Source
In our example, it becomes: "Contains hyaluronic acid ➡️ Helps retain water ➡️ Skin stays hydrated longer ➡️ Here are the scientific studies: X."
The Reason Why Doesn't Necessarily Have to Be Scientific
In the previous example, I used a scientific explanation because we were talking about a moisturizer and how one of its ingredients works, but that doesn't mean every reason why has to be based on a scientific study; it can take any form that helps make the promise credible:
- "We deliver within 24 hours..." ➡️ "...because the product is already in stock at our warehouses."
- "Our shoes are lightweight..." ➡️ "...because the sole is made from a low-density foam material; here's the demonstration video: X."
Whenever you write any kind of marketing copy, you have to imagine that the reader is constantly asking, "Why are you able to promise me this?"
The sentence immediately following the promise must therefore answer that question as simply as possible.
An Important Distinction
The reason why is not the proof.
The two elements have to work together, but they serve different purposes.
The reason why explains why something should work, while the proof provides the technical or scientific evidence that supports that explanation, which can also take the form of case studies, testimonials, or other verifiable evidence.
For example: "The mattress dissipates heat more effectively because it uses an open-cell internal structure."
That's the promise + the reason why, and now all that's missing is the proof, which could be:
In a laboratory test, the surface recorded a temperature X °C lower than that of the product used for comparison. Here you can view the test and review the full results: X.
Why It's So Important
Many people have bought something at least once, whether online or in a physical store, only to discover that it was completely different from the way it had been presented.
Others have seen offers that seemed incredible, only to discover that they were massive rip-offs.
Even people who haven't had these experiences firsthand can still read about them online through negative testimonials or YouTube reviews.
Over time, people have developed natural barriers of distrust, so modern readers tend to scrutinize everything they're told online or on TV.
As a result, you can no longer simply write a sentence and expect people to accept it without question.
When you write marketing copy, you have to learn to give readers enough information to verify the points that matter most.
A good reason why closes the gap between promise and credibility, while verifiable proof completes the job.