Published onMarch 13, 2026Build AI Apps with LangChain and Pythonpythonailangchainmachine-learningnautal-language-processingautomationopenaiLangChain is the most popular framework for building LLM-powered applications in Python. From chatbots to document Q&A to autonomous agents — this guide shows you how to build real AI apps with LangChain and modern LLMs.