In an n8n cluster node, a sub-node is a supporting node connected to a root node that provides a specific capability or resource, extending the root node's functionality. [Example] Imagine you build an AI Agent in n8n. The AI Agent is the root node. To perform its job, it may need additional capabilities, such as an AI model, memory, or tools. You connect a Chat Model to the AI Agent. The Chat Model acts as a sub-node because it provides the language model the agent needs to process information and generate responses. You can also connect a Memory sub-node. Memory allows the AI Agent to retain and use information from previous interactions when needed. You can then connect a tool, such as Google Sheets. This allows the AI Agent to interact with Google Sheets when needed. So, the AI Agent is the root node, while the Chat Model, Memory, and tools are sub-nodes. Together, they form a cluster that extends what the AI Agent can do.

In n8n, a project is a way to group related workflows, credentials, and variables for easier organization, management, and team collaboration. [Example] Imagine you run an AI automation agency and have three clients: a shoe store, a real estate company, and a restaurant. Each client has different workflows, credentials, and variables. You could create a separate n8n project for each client. This keeps each client's related resources organized and separated from the others. For the shoe store, the project could contain workflows for customer emails, order updates, and refunds, along with the credentials and variables those workflows need. For the restaurant, you could have a separate project containing workflows for reservations, customer inquiries, and review requests, along with the restaurant's related credentials and variables. Now, when you need to manage a client, the client's related workflows and project resources are grouped together instead of being mixed with resources for other clients. That's the main idea of an n8n project: group related resources together so they are easier to organize, manage, and collaborate on.

The root node is the main node in an n8n cluster node that defines its core functionality. Sub-nodes attach to it to extend its capabilities. [Example] An AI Agent node can be the root node. It provides the main functionality for using AI to accomplish a task. You can then connect sub-nodes such as a Chat Model, Memory, and Tools to the AI Agent. These sub-nodes provide additional capabilities the agent needs. So the structure looks like this: - AI Agent = root node. - Chat Model, Memory, and Tools = sub-nodes. The easiest way to remember it: the root node is the main part of the cluster node, while sub-nodes provide additional capabilities.

New to n8n? Here's what a node actually is. A node is a single building block in an n8n workflow. It can start the workflow, fetch, send, or process data, control the flow logic, or connect to an external service. You link multiple nodes together to create a complete automation.

I'm Aatar Atta, and I help businesses automate operations, reduce costs, and scale with AI. I've joined this community to learn from Brendan and its members, to share my knowledge and contribute to making this community more valuable, and to network with like-minded people.