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Frameworks & Tools
LangChain
An open-source framework of building blocks for LLM applications, RAG, and agents.
Definition
LangChain is an open-source framework that provides modular building blocks for LLM applications — prompt templates, chains, tool integrations, memory, and retrieval. It abstracts common patterns like retrieval-augmented generation and multi-step agent loops, letting developers wire together components from different providers with little boilerplate. It helped popularize the patterns behind RAG and agents.