Hallucination
A hallucination is when an AI states something wrong or invented, and says it as if it were true.
In a simple example
You ask for the opening hours of a real shop, and it gives confident hours that it made up.
Why it matters to you
You must check facts, prices, names and links that the AI gives, before you put them on your site.
Do not confuse with
It is not a lie on purpose. The AI simply fills a gap with a likely sounding answer.