---
title: "Interface: Extension"
description: Docker extension API reference
keywords: Docker, extensions, sdk, API, reference
aliases:
- /desktop/extensions-sdk/dev/api/reference/interfaces/Extension/
- /extensions/extensions-sdk/dev/api/reference/interfaces/Extension/
---
**`Since`**
0.2.0
## Properties
### vm
• `Optional` `Readonly` **vm**: [`ExtensionVM`](ExtensionVM.md)
___
### host
• `Optional` `Readonly` **host**: [`ExtensionHost`](ExtensionHost.md)
___
### image
• `Readonly` **image**: `string`
**`Since`**
0.3.3