> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Using ComfyUI as a Developer

ComfyUI is a powerful GenAI inference engine that can be used to run AI models locally, create workflows, develop custom nodes, and be deployed as a server.

ComfyUI's key capabilities are:

* **[Creating Workflows](/development/core-concepts/workflow)**: Workflows are a way to orchestrate AI models and automate tasks. They are a series of nodes that are connected together to form a pipeline.
* **[Custom Nodes](/custom-nodes/overview)**: Custom nodes can be written by anyone to extend the capabilities of ComfyUI for your own use. Nodes are written in Python and are published by the community.
* **Extensions**: Extensions are 3rd party applications that improve the UI of ComfyUI.
* **[Local Server API](/development/comfyui-server/comms_overview)**: ComfyUI can be deployed in your own environment as an API endpoint.
* **[Cloud API](/development/cloud/overview)**: Run workflows programmatically on ComfyUI Cloud infrastructure without managing your own hardware.