Glossary term
Hallucination
A fluent AI answer that includes invented, incorrect, or unsupported information.
Plain-English meaning
A fluent AI answer that includes invented, incorrect, or unsupported information. In everyday AI use, this term matters because it affects what the tool can answer, remember, verify, or safely provide.
Why it matters
Understanding this term helps users avoid bad assumptions. Many AI problems are not caused by one simple failure. They may come from product limits, safety rules, privacy boundaries, copyright limits, account permissions, or unclear prompts.