LangGraph is a low-level orchestration framework from LangChain for building, managing, and deploying long-running, stateful language agents. It models agent workflows as graph-based pipelines, provides APIs for persistent state management, and includes a visual studio for inspecting and debugging execution. LangGraph separates the agent orchestration primitives from deployment concerns so developers can create resilient, controllable agents and then deploy and scale them using the LangGraph Platform. Its value lies in combining graph-based workflow control, first-class state persistence, and developer tooling to support complex conversational agents and automated LLM-backed workflows.