What is Hallucination?
When AI makes up false information with total confidence, as if it were real.
// Explanation
Hallucinations are the Achilles' heel of LLMs. The model doesn't 'know' when it doesn't know something — it simply generates the most probable text, which sometimes is wrong but sounds convincing. Made-up citations, nonexistent statistics, wrong dates... all presented with the confidence of an expert.
// Example
You ask an LLM about a scientific study and it gives you a title, authors, journal, and year — all fabricated. The reference doesn't exist. But it sounded great.