LLM RAG AI Agent Architecture: Understanding the Three-Layer System for Intelligent AI

Understanding LLM, RAG, and AI Agent: The Three-Layer Architecture of Intelligent AI Systems Core Question This Article Answers: What are the differences between LLM, RAG, and AI Agent, and how do they work together to build effective, production-ready AI systems? In the field of artificial intelligence, many developers and product managers often feel confused about the relationships between LLM, RAG, and AI Agent. Some view them as competing technologies, but in reality, they represent three essential layers of a single intelligent system. Through my experience building practical AI systems over the past two years, I’ve come to understand that only …