# Backend
<a name="API_Backend"></a>

An object that represents the backends that a virtual node is expected to send outbound traffic to.

## Contents
<a name="API_Backend_Contents"></a>

**Important**  
This data type is a UNION, so only one of the following members can be specified when used or returned.

 ** virtualService **   <a name="appmesh-Type-Backend-virtualService"></a>
Specifies a virtual service to use as a backend.   
Type: [VirtualServiceBackend](API_VirtualServiceBackend.md) object  
Required: No

## See Also
<a name="API_Backend_SeeAlso"></a>

For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon SDK for C\+\+](https://docs.amazonaws.cn/goto/SdkForCpp/appmesh-2019-01-25/Backend) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/appmesh-2019-01-25/Backend) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/appmesh-2019-01-25/Backend)