# 🦜️🔗 LangChain

⚡ Building applications with LLMs through composability ⚡

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## Quick Install

`pip install langchain`

## 🤔 What is this?

Large language models (LLMs) are emerging as a transformative technology, enabling
developers to build applications that they previously could not.
But using these LLMs in isolation is often not enough to
create a truly powerful app - the real power comes when you can combine them with other sources of computation or knowledge.

This library is aimed at assisting in the development of those types of applications.

## 📖 Documentation

Please see [here](https://langchain.readthedocs.io/en/latest/?) for full documentation on:

- Getting started (installation, setting up the environment, simple examples)
- How-To examples (demos, integrations, helper functions)
- Reference (full API docs)
  Resources (high-level explanation of core concepts)

## 🚀 What can this help with?

There are four main areas that LangChain is designed to help with.
These are, in increasing order of complexity:

**📃 LLMs and Prompts:**

This includes prompt management, prompt optimization, generic interface for all LLMs, and common utilities for working with LLMs.

**🔗 Chains:**

Chains go beyond just a single LLM call, and are sequences of calls (whether to an LLM or a different utility). LangChain provides a standard interface for chains, lots of integrations with other tools, and end-to-end chains for common applications.

**🤖 Agents:**

Agents involve an LLM making decisions about which Actions to take, taking that Action, seeing an Observation, and repeating that until done. LangChain provides a standard interface for agents, a selection of agents to choose from, and examples of end to end agents.

**🧠 Memory:**

Memory is the concept of persisting state between calls of a chain/agent. LangChain provides a standard interface for memory, a collection of memory implementations, and examples of chains/agents that use memory.

For more information on these concepts, please see our [full documentation](https://langchain.readthedocs.io/en/latest/?).

## 💁 Contributing

As an open source project in a rapidly developing field, we are extremely open
to contributions, whether it be in the form of a new feature, improved infra, or better documentation.

For detailed information on how to contribute, see [here](CONTRIBUTING.md).