LangChain is an open source framework for building applications based on large language models (LLMs). LLMs are large deep-learning models pre-trained on large amounts of data that can generate responses to user queries—for example, answering questions or creating images from text-based prompts.

LangChain is an open source orchestration framework for the development of applications using large language models (LLMs). Available in both Python- and Javascript-based libraries, LangChain's tools and APIs simplify the process of building LLM-driven applications like chatbots and virtual agents.

LangChain helps AI developers integrate language models with various external data sources. As an open-source project, it garners strong community support. Developers can use LangChain at no cost and benefit from the expertise of other developers who are well-versed in the framework.

The default collection name used by LangChain is "langchain".