LangChain is an open-source framework aimed at simplifying the development of applications that utilize large language models (LLMs). It offers tools and abstractions to seamlessly connect LLMs with external data sources, facilitating the creation of context-aware and reasoning-driven applications. LangChain supports the entire application lifecycle, encompassing development, debugging, deployment, and monitoring. This comprehensive support makes it easier for developers to build robust and scalable AI-powered solutions.