NLP
Hallucination
When an AI confidently states something that is completely made up, presenting fiction as fact with total certainty.
Definition
The generation of plausible-sounding but factually incorrect or nonsensical outputs by language models. Occurs because LLMs predict probable tokens, not verified facts. A major challenge for production AI.
Why it matters
The #1 trust barrier for enterprise AI adoption. Mitigation strategies (RAG, grounding, evals) are critical.
Related terms in NLP
BERT
Google's breakthrough AI model that reads sentences in both directions at once to understand context better.
Chain of Thought (CoT)
Asking an AI to "show its work" and think step-by-step, which makes it much better at solving math and logic problems.
Context Window
The maximum amount of text an AI can read and consider at one time, like how many pages of notes it can hold in its head.
Conversational AI
AI that can have natural back-and-forth conversations with humans, chatbots, voice assistants, and customer service bots.
From vocabulary to outcomes
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