# LangChain

> A popular framework for building LLM applications — chains and agents that wire models to data sources, tools and memory.

Every LLM application is the same plumbing — load documents, retrieve the right fragment, call the model, parse the answer, maybe call a tool — and LangChain packages that plumbing into composable pieces. It made prototypes fast, which is both its achievement and the source of its reputation.

The honest assessment is that the abstraction earns its complexity on big agent systems and gets in the way on simple ones: for a single retrieval call plus a prompt, plain API calls are easier to debug than a framework's object graph. Use it where the orchestration genuinely needs orchestrating.

## Related terms

- https://dfieldsolutions.com/en/glossary/llm-agent.md
- https://dfieldsolutions.com/en/glossary/rag.md
- https://dfieldsolutions.com/en/glossary/tool-calling.md

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Source: https://dfieldsolutions.com/en/glossary/langchain
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