What is RAG? The technique that makes bots answer from your data instead of inventing

How RAG works step by step

• Your documents are split into small passages.
• Each passage becomes a numeric representation of its meaning (an embedding) stored in a vector database.
• A question is embedded the same way and the closest passages are retrieved.
• Those passages go to the model with the question and an instruction: answer only from these.
• The model replies and the source is kept for review.

Why RAG beats “training” the model on your data

Because your data changes: prices, policies, stock. With RAG, updating the document or database changes the answer immediately, with no costly retraining. You can also see which source an answer used, and remove information by removing its document.

RAG’s limits

Answers are only as good as your documents: contradictory or outdated documents produce contradictory answers. That’s why serious RAG projects start by cleaning the knowledge base and naming an owner to update each document.