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Hey everyone, it’s Robby!

As a software engineer who builds AI systems for a living, I get asked this question all the time: "Robby, how does the AI know so much?"

Most people think AI works like a giant library or a search engine. They think it goes out, finds a fact, and shows it to you. But that is actually not how it works at all.

Today, I want to talk about why AI sometimes makes things up—a problem we call "hallucinations."

The AI is a Prediction Machine, Not a Truth Machine

Imagine you are playing a game where you have to guess the next word in a sentence. If I say, "The sky is...", you’d probably say "blue."

Large Language Models (LLMs) are basically super-powered versions of that game. They aren't looking at a database of facts; they are just guessing what word should come next based on patterns they learned while reading the internet.

Because they are probability engines and not truth engines, they prioritize two things:

  • Sounding human.
  • Being plausible.

Why AI "Hallucinates"

Sometimes, the AI doesn't have the exact fact you asked for. But because it’s a genius at grammar and sounding smart, it will fill in the blanks with something that sounds true.

It might even make up:

  • Court cases that never happened.
  • Books that don't exist.
  • Quotes from people who never said them.

It sounds very confident when it does this! That’s why it’s so easy to be tricked.

How to Stay Safe

I love AI, and I use it every day to build cool stuff. But you should never treat it as an expert who is always right. Here is my advice:

  1. Always double-check: If the AI gives you a fact, look it up in a real, trusted source.
  2. Don't use it for legal or medical advice: AI can sound like a lawyer or a doctor, but it doesn't have a brain or a license!
  3. Use it for help, not for truth: Use AI to help you write code, brainstorm ideas, or summarize notes. Just don't let it be the final judge of what is true.

AI is a powerful tool, but it’s up to us to be the pilots. Never trust the AI blindly—always verify what it tells you!