Building a Chatbot with LangChain and OpenAI

Building a chatbot that can maintain context, access external knowledge, and provide accurate responses is one of the most practical applications of large language models. LangChain provides the framework to orchestrate these capabilities, while OpenAI's models power the intelligence. In this guide, we'll build a production-ready chatbot step by step, covering conversation memory, retrieval-augmented generation (RAG), tool integration, and deployment considerations.