LangChain - LLM Applications with Agents & RAG

The most popular framework for building LLM-powered applications.

When to Use

• Building agents with tool calling and reasoning (ReAct pattern)
• Implementing RAG (retrieval-augmented generation) pipelines
• Need to swap LLM providers easily (OpenAI, Anthropic, Google)
• Creating chatbots with conversation memory
• Rapid prototyping of LLM applications

Core Components