What is RAG? Retrieval Augmented Generation Explained
March 4, 2026
RAG Explained — How to Give Your LLM a Memory Without Retraining
You’ve probably noticed that ChatGPT doesn’t know about events from last week, or that your company’s fine-tuned model can’t answer questions about your internal documentation. Most people assume the solution is retraining the model with new data—an expensive, time-consuming process requiring GPU clusters and ML expertise.
There’s a better way. LLMs don’t actually need to “learn” new information to use it effectively. They just need access to it at the right moment. That’s the insight behind RAG (Retrieval Augmented Generation), and it’s why you’re seeing it everywhere from customer support bots to research assistants.