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Hallucination
Fundamentals“huh-LOO-sih-NAY-shun”
2/5 · Getting there
When an AI confidently gives an answer that is simply made up.
Lesson #2: Working With AI: Prompts, Data & Guardrails →Think of it like…
A confident coworker who'd rather guess than admit they don't know.
Everyday example
An AI inventing a book title that was never written.
Construction example
An AI citing a building code section number that doesn't exist.
Business example
An AI quoting a refund policy your company never had.
Why this matters
AI can be wrong while sounding certain — always verify facts that carry money or legal risk.
One-sentence summary
A hallucination is a confident AI answer that isn't true.
Try it yourself
Ask an AI a very specific factual question about your industry, then check the answer against a real source.
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