bRAG-langchain is an open-source project focused on the research and application of Retrieval-Augmented Generation (RAG) technology. RAG is an AI technology that combines retrieval and generation. By retrieving relevant documents and generating answers, it provides users with more accurate and comprehensive information. This project provides a guide to RAG implementation, from basic to advanced, helping developers quickly get started and build their own RAG applications. Its key advantages are its open-source nature, flexibility, and ease of extension, making it suitable for various applications requiring natural language processing and information retrieval.