In ordinary AI use, the term often refers to invented facts, references, quotes or details that are not grounded in the available evidence.
A practical example
An assistant might produce a plausible article title and URL for a paper that does not exist.
What to remember
Confidence of wording does not establish accuracy. Check the source and the specific claim, rather than relying on a second confident answer.
Put it into practice
Use the answer-checking guide to keep evidence and uncertainty visible when working with AI.