An Introduction to LangChain the Python Framework for LLM Applications

LangChain is a Python framework for building Large Language Model (LLM) driven applications. By connecting LLMs with external data sources, tools, and memory systems, it enables developers to quickly build RAG question-answering, intelligent agents, chatbots, and other AI applications. This article provides a brief introduction to LangChain's core concepts, architecture, and a beginner-friendly practical example.