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What is Hallucination?

A plain-English explanation of Hallucination (AI Hallucination) — what it means, why it matters, and how it is used in AI.

Hallucination
AI Hallucination
AI hallucination refers to when an AI model generates information that is factually incorrect, fabricated, or completely made up, but presents it with the same confidence as accurate information.
"A language model asked about a legal case might invent a plausible-sounding case name, citation, and ruling that does not actually exist."

Also known as: Confabulation, AI confabulation, model hallucination

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Why does Hallucination matter?

Understanding hallucination is critical for anyone using AI in legal, medical, financial, or factual contexts.

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