Where "explain like I'm 5" comes from
The phrase comes from Reddit's r/explainlikeimfive, where people ask for plain-language explanations of complicated things. The subreddit's own rules say answers aren't meant for actual five-year-olds. The goal is an explanation a curious adult with no background can follow.
That distinction matters when you type "explain like I'm 5" into ChatGPT. It often takes you literally.
Why the plain ELI5 prompt disappoints
Ask ChatGPT to "explain quantum entanglement like I'm 5" and you'll usually get magic dice, best friends who always know how the other feels, and a lot of exclamation marks. It's simple, but you've learned almost nothing, and some of the analogies are wrong in ways that will confuse you later.
There are three common failures:
- Talking down. The tone fits a child, so you skim it.
- Analogies that break. A good analogy shows one feature of the real thing. A bad one quietly suggests features that aren't there.
- Simple but false. Simplifying means leaving out detail. It shouldn't mean saying something untrue.
The fix is to tell ChatGPT who you really are and what you already know.
Better prompts than "like I'm 5"
Describe the reader, not an age
Explain how vaccines train the immune system. I'm an adult with no biology background. I know what cells and viruses are, roughly. Use plain words, and if you need a technical term, define it once.
Saying what you already know does more than any age. ChatGPT pitches the explanation at the edge of your knowledge instead of starting from zero or skipping ahead.
Ask for an example before the definition
Start with a concrete example I'd recognize, then explain the general idea.
Most textbook explanations go definition first, then example. For a new idea, the other order is easier to follow, because the example gives the definition something to attach to.
Ask where the analogy breaks
Give me one analogy for this, then tell me where the analogy stops being accurate.
This one prompt fixes most bad ELI5 answers. You keep the intuition and you know where it ends.
Climb a ladder
Explain this at three levels: first in two sentences for someone with no background, then in a paragraph for a high school student, then the way a university course would put it.
Read the first level, make sure it makes sense, then go up. If the second level loses you, ask about that specific step. It also shows you where your understanding stops.
Ask it to check its own simplification
Now list anything in your simple explanation that's technically wrong or misleading, and say what the accurate version is.
ChatGPT often catches its own oversimplifications when you ask directly. It rarely does it unprompted.
An example: why the sky is blue
A plain "ELI5 why is the sky blue" often gets something like "sunlight is made of colors and the blue one bounces around the most!" That's fine as far as it goes, but it raises an obvious question it doesn't answer. Why isn't the sky violet, if violet has an even shorter wavelength?
With the "describe the reader" prompt and an ask for where the simple version breaks, you get something closer to this:
Sunlight contains every color. When it passes through the air, tiny gas molecules scatter some of it in all directions. They scatter short wavelengths, the blue end, much more strongly than long wavelengths like red. So when you look at any patch of sky away from the sun, you're seeing light that was scattered toward you, and most of it is blue.
Violet light scatters even more, but the sun gives off less violet than blue, and our eyes are less sensitive to it. So the sky looks blue to us.
It's a little longer and still simple, and it answers the follow-up question you'd have had.
Make it show, not just tell
Some ideas are hard to grasp from text alone. You need to see the steps happen in order. For those, ask for something visual:
- "Draw this as a simple step-by-step diagram." ChatGPT can make an image, or a text diagram if you'd rather have one you can copy.
- "Walk me through it with numbers. Pick small values and show each step."
- "Describe what I'd see if I could watch this happen in slow motion."
Or turn the explanation into a short narrated lesson. With Lesson Video added to ChatGPT, you can say "make this a short lesson I can watch" after a good explanation. ChatGPT writes a few scenes and a script, and the lesson plays in the chat with a voice, captions and simple animation. It ends with a question, so you find out straight away whether the simple version actually landed.
Check that it clicked
A simple explanation can feel clear while you read it and be gone an hour later. Two quick checks:
- Explain it back. "I'll explain this back to you in my own words. Tell me what I got wrong or left out." The Feynman technique guide is built around this.
- Apply it. "Give me a new situation and ask me what would happen." If you can predict the result, you understand it. If you can only repeat the explanation, you don't yet.
Prompts to copy
- "Explain topic. I already know X and Y, but not Z. Plain words, define any technical term once."
- "Give me one everyday example first, then the general rule."
- "One analogy, then where it breaks."
- "Three levels: two sentences, one paragraph, university level."
- "What did your simple version get wrong?"
- "Ask me one question to check I understood. Wait for my answer."