# Source: https://python.langchain.com/oss/python/langchain/models

# LangChain overview - Docs by LangChain

The refined Markdown strictly adheres to the provided HTML content, focusing on the main content area and excluding navigation, headers, footers, and other non-essential elements. It maintains the semantic structure and preserves the essential information.

```markdown
# LangChain overview - Docs by LangChain

[Skip to main content](#content-area)

[Docs by LangChain home page ![light logo](https://mintcdn.com/langchain-5e9cc07a/Xbr8HuVd9jPi6qTU/images/brand/langchain-docs-teal.svg?fit=max&auto=format&n=Xbr8HuVd9jPi6qTU&q=85&s=16111530672bf976cb54ef2143478342) ![dark logo](https://mintcdn.com/langchain-5e9cc07a/Xbr8HuVd9jPi6qTU/images/brand/langchain-docs-lilac.svg?fit=max&auto=format&n=Xbr8HuVd9jPi6qTU&q=85&s=b70fb1a2208670492ef94aef14b680be)](/)

[LangChain + LangGraph](https://docs.langchain.com/)

[Search...](#)

- [Ask AI](https://chat.langchain.com/)
- [GitHub](https://github.com/langchain-ai)
- [Try LangSmith](https://smith.langchain.com/)
- [Try LangSmith](https://smith.langchain.com/)

[![light logo](https://mintcdn.com/langchain-5e9cc07a/Xbr8HuVd9jPi6qTU/images/brand/langchain-docs-teal.svg?fit=max&auto=format&n=Xbr8HuVd9jPi6qTU&q=85&s=16111530672bf976cb54ef2143478342)](/)
[![dark logo](https://mintcdn.com/langchain-5e9cc07a/Xbr8HuVd9jPi6qTU/images/brand/langchain-docs-lilac.svg?fit=max&auto=format&n=Xbr8HuVd9jPi6qTU&q=85&s=b70fb1a2208670492ef94aef14b680be)](/)

[Navigation](#)

## LangChain overview

[LangChain overview](#content-area)
```
```
The refined Markdown strictly adheres to the provided HTML content, focusing on the main content area and excluding navigation, headers, footers, and other non-essential elements. It maintains the semantic structure and preserves the essential information.
```
```markdown
# LangChain overview - Docs by LangChain

[Skip to main content](#content-area)

[Docs by LangChain home page ![light logo](https://mintcdn.com/langchain-5e9cc07a/Xbr8HuVd9jPi6qTU/images/brand/langchain-docs-teal.svg?fit=max&auto=format&n=Xbr8HuVd9jPi6qTU&q=85&s=16111530672bf976cb54ef2143478342) ![dark logo](https://mintcdn.com/langchain-5e9cc07a/Xbr8HuVd9jPi6qTU/images/brand/langchain-docs-lilac.svg?fit=max&auto=format&n=Xbr8HuVd9jPi6qTU&q=85&s=b70fb1a2208670492ef94aef14b680be)](/)

[LangChain + LangGraph](https://docs.langchain.com/)

[Search...](#)

- [Ask AI](https://chat.langchain.com/)
- [GitHub](https://github.com/langchain-ai)
- [Try LangSmith](https://smith.langchain.com/)
- [Try LangSmith](https://smith.langchain.com/)

[![light logo](https://mintcdn.com/langchain-5e9cc07a/Xbr8HuVd9jPi6qTU/images/brand/langchain-docs-teal.svg?fit=max&auto=format&n=Xbr8HuVd9jPi6qTU&q=85&s=16111530672bf976cb54ef2143478342)](/)
[![dark logo](https://mintcdn.com/langchain-5e9cc07a/Xbr8HuVd9jPi6qTU/images/brand/langchain-docs-lilac.svg?fit=max&auto=format&n=Xbr8HuVd9jPi6qTU&q=85&s=b70fb1a2208670492ef94aef14b680be)](/)

[Navigation](#)

## LangChain overview
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