---
title: 'How RAG Stops AI Hallucinations | RAG Explained for Beginners'
source: 'https://youtube.com/watch?v=quV3q857djc'
video_id: 'quV3q857djc'
date: 2026-08-08
duration_sec: 115
---

# How RAG Stops AI Hallucinations | RAG Explained for Beginners

> Source: [How RAG Stops AI Hallucinations | RAG Explained for Beginners](https://youtube.com/watch?v=quV3q857djc)

## Summary

This video explains why AI models hallucinate and how Retrieval-Augmented Generation (RAG) fixes the problem. It breaks down the technical process of how AI stores patterns rather than facts, and how RAG grounds responses with real data.

### Key Points

- **AI Hallucinations Explained** [00:02] — AI models give confident wrong answers because they store patterns, not facts, from training data.
- **How AI Processes Text** [00:15] — Text is broken into tokens, converted into embeddings (numbers), and compressed into billions of weights inside the model.
- **The Core Problem** [00:29] — AI never stores facts; it stores patterns. When it doesn't know an answer, it guesses rather than admitting ignorance.
- **RAG Solution Overview** [00:42] — RAG (Retrieval-Augmented Generation) fixes hallucinations by retrieving real data before generating an answer.
- **Vector Database Storage** [00:57] — Your documents are converted into vectors and stored in a vector database for permanent retrieval.
- **Retrieval Process** [01:10] — When a question is asked, it's converted into an embedding, and cosine similarity finds the most relevant chunks in milliseconds.
- **Grounding the Answer** [01:23] — The retrieved chunks are injected into the context window before the LLM answers, grounding the response in verified data.
- **RAG Outcome** [01:36] — With RAG, the same model retrieves data instead of guessing, eliminating confident wrong answers and hallucinations.

### Conclusion

RAG is a powerful technique that grounds AI responses in real data, effectively eliminating hallucinations. It's a key method for building reliable AI applications.

## Transcript

wrong answers confidently? Do you know why that happens? And that has a name a glitch, it's literally how AI is built. And here's what happened inside. When AI is trained, billions of
documents are feed into it. The text got broken into tiny pieces called tokens, into numbers called embedding. Where similar words get a similar number. And [music] all of those get compressed into billions of weight inside the model.
Now, here's the problem. The AI never stored the fact. It stored the pattern. >> So, when you ask it something, it doesn't just look up the answers, it when it doesn't know the answer, it doesn't say, "I don't know." It just
And [music] that's hallucination. So, here's how we fix this using RAG. Your [music] gets broken down into tokens, crunched into an embedding, and then converted into a number. Now, they are called as
vectors. Those [music] vectors get stored into a vector database. Permanent forgetting. And now when you ask the question, the question also becomes the embedding, [music] converted into number instantly, and those numbers get stored
in the vector database. And using the cosine similarity, databases [music] the number, pulled out in the milliseconds. [music] And those real matching chunks get injected into a context window right before the LLM
answer. Fresh start, verified information, real data. Now, [music] the LLM reads the actual retrieved facts before writing a single word. And that's what called [music] grounding. Same model, same weight, but now it doesn't
just guess, it retrieves the data and it answers. No more confident wrong answers, no more hallucination, and that is RAG. [music] And that's how every you like the information, subscribe to Singular on YouTube channel.