LangChain is an open-source framework designed to simplify the development of applications powered by large language models (LLMs). The framework provides a standard interface for connecting LLMs with various data sources, APIs, and computational tools, enabling developers to create sophisticated AI applications more efficiently.

The platform offers pre-built components and abstractions that streamline common tasks in LLM application development, such as prompt management, memory handling, and chain orchestration. LangChain supports multiple LLM providers and allows developers to switch between different models seamlessly while maintaining consistent application code.

As both an open-source project and a commercial platform, LangChain serves developers ranging from individual builders to enterprise teams. The framework has become a foundational tool in the AI developer ecosystem, enabling rapid prototyping and production deployment of LLM-powered applications.