# Block Subgraph asset

> Reference for a subgraph asset that packages operators and blocks together to use as a single block.

A Subgraph is an Asset that contains part of a Visual Effect Graph. A Subgraph appears as a single Node that you can use in another Visual Effect Graph or Subgraph. A Block Subgraph is a Subgraph that contains a set of [Operators](https://docs.unity3d.com/Packages/com.unity.visualeffectgraph@latest/index.html?subfolder=/manual/Operators.html) and [Blocks](https://docs.unity3d.com/Packages/com.unity.visualeffectgraph@latest/index.html?subfolder=/manual/Blocks.html) packaged together to use as a Block.

This Asset only works when you install the Visual Effect Graph package. For information on how to install the Visual Effect Graph, see the [packages documentation](/engine/6000.6/manual/packages-list/managing-packages-window/upm-ui-actions/upm-ui-install.md).

For information on how to use Block Subgraphs, see the Visual Effect Graph [package documentation](https://docs.unity3d.com/Packages/com.unity.visualeffectgraph@latest/index.html?subfolder=/manual/Subgraph.html%23block-subgraphs).