> ## Documentation index
> Fetch the complete documentation index at: https://arize.com/llms.txt
> Ask it with GET https://arize.com/ask?q=<keywords or question>. Short keywords rank best.
> Use these to discover all available pages before exploring further.

# LangChain

> LangChain is an open-source framework for building language model applications with prompt chaining, memory, and external integrations

<Card title="LangChain" href="https://www.langchain.com/" icon="globe" horizontal>
  [](https://www.langchain.com/)
</Card>

<Columns cols={2}>
  <Card img="https://storage.googleapis.com/arize-phoenix-assets/assets/images/phoenix-docs-images/f1e5c9e9-image.avif" horizontal title="LangChain Tracing" href="/docs/phoenix/integrations/python/langchain/langchain-tracing"/>
</Columns>

## Featured Tutorials

<Columns cols={2}>
  <Card img="https://storage.googleapis.com/arize-phoenix-assets/assets/images/phoenix-docs-images/568f9035-image.jpeg" horizontal title="Tracing of LangChain Agent" href="https://github.com/Arize-ai/phoenix/blob/main/tutorials/tracing/langchain_agent_tracing_tutorial.ipynb"/>
  <Card img="https://storage.googleapis.com/arize-phoenix-assets/assets/images/phoenix-docs-images/093aab5e-image.jpeg" horizontal title="How to Build an AI Agent" href="https://arize.com/blog/how-to-build-an-ai-agent/"/>
</Columns>