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zachary62
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---
layout: default
title: "Channels"
parent: "LangGraph"
nav_order: 3
---
# Chapter 3: Channels - The Communication System
In [Chapter 1: Graph / StateGraph](01_graph___stategraph.md), we learned about the `StateGraph` as the blueprint for our application, holding the shared "whiteboard" or state. In [Chapter 2: Nodes (`PregelNode`)](02_nodes___pregelnode__.md), we met the "workers" or Nodes that perform tasks and read/write to this whiteboard.