---
contentType: overview
title: Cluster nodes
description: Understand cluster nodes in n8n, and browse the cluster nodes library.
---

# Cluster nodes

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## Root nodes

Each cluster starts with one [root node](/glossary.md#root-node-n8n).

## Sub-nodes

Each root node can have one or more [sub-nodes](/glossary.md#sub-node-n8n) attached to it.