LangChain

What is LangChain?

LangChain is the most popular open-source framework for building applications powered by large language models. It provides composable abstractions for chaining LLM calls, building autonomous agents, implementing RAG (retrieval-augmented generation), and connecting models to external tools and data sources. LangChain supports every major LLM provider, vector store, and embedding model. LangGraph extends it with stateful, multi-actor agent workflows. LangSmith provides observability, testing, and evaluation for LLM apps. The ecosystem has become the default starting point for developers building AI-powered applications, with a massive community and extensive documentation.

Key Features

Frequently Asked Questions