“`html

How to Build a Custom RAG Chatbot with OpenAI & LangChain – A Hands-On Tutorial

1. What is RAG and Why It Matters for Your AI Projects

• Define Retrieval-Augmented Generation (RAG) and how it combines retrieval with LLMs to reduce hallucinations.
• Explain the core advantage: grounding AI responses in your own data (documents, PDFs, knowledge bases).
• Outline real-world use cases — customer support, internal Q&A, research assistants.