RAG Theory — Complete Reference
A focused theory reference for Retrieval-Augmented Generation, from first principles to a production-ready architecture. It explains the core problem RAG solves, the retrieval pipeline, and the design decisions that make it work in practice.
RAG is simple enough to draw in six boxes and subtle enough to fail in every one of them. Before choosing a vector database or an orchestration framework, an architect needs a reliable mental model of the two pipelines and the contracts that connect them.
This reference is the compact route through that theory. It explains why retrieval exists, why ingestion and querying must remain separate, how chunking changes meaning, what embeddings preserve, and how storage and retrieval choices shape the final answer.
It is intentionally narrower than The RAG Bible. Use this document when you want the conceptual spine first: the vocabulary, trade-offs, and production architecture that make deeper implementation decisions easier to reason about.
What this edition gives you
- 01
The ingestion and query pipelines, clearly separated
- 02
Chunking, embeddings, vector storage, and retrieval fundamentals
- 03
A direct path from first principles to production architecture