Hallucination
Definition
When an AI tool produces information that is confidently stated but factually wrong. Not a glitch, not a virus — the AI is doing exactly what it's designed to do (predict the most likely next word based on patterns), and sometimes that produces plausible-sounding nonsense. It's an inherent limitation, not a scandal. It means you should verify important facts, especially for anything consequential.
Why It Matters
This is the most common reason people lose trust in AI tools after their first experience. Understanding why it happens makes it manageable rather than alarming.
What does that look like in practice?
You ask for a book recommendation and the AI invents a real-sounding title that doesn't actually exist.
What people actually mean when they say this
When someone says 'the AI lied to me,' they usually mean it hallucinated, stated something wrong with confidence, not that it set out to deceive.
Last reviewed: March 2026
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