A simple explanation of how AI models can 'look up' information they weren't trained on, like an open-book test.
1. **Accuracy**: The AI is less likely to make things up (hallucinate) because it has the facts right in front of it.
2. **Freshness**: You can add a new document today, and the AI can answer questions about it immediately. You don't have to re-train the whole brain.
3. **Privacy**: You can keep your private data in your own "library" and just show it to the AI when needed, instead of sending it all to a public model company.