# Function
<a name="API_Function"></a>

Defines reusable logic that MediaTailor executes at lifecycle hooks during ad insertion. The `FunctionType` determines the function's runtime behavior. For more information about functions, see [Working with functions](https://docs.aws.amazon.com/mediatailor/latest/ug/monetization-functions.html) in the *MediaTailor User Guide*.

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

 ** FunctionId **   <a name="mediatailor-Type-Function-FunctionId"></a>
The identifier of the function.  
Type: String  
Required: Yes

 ** FunctionType **   <a name="mediatailor-Type-Function-FunctionType"></a>
The type of the function.  
Type: String  
Valid Values: `HTTP_REQUEST | CUSTOM_OUTPUT | SEQUENTIAL_EXECUTOR`   
Required: Yes

 ** Arn **   <a name="mediatailor-Type-Function-Arn"></a>
The Amazon Resource Name (ARN) of the function.  
Type: String  
Required: No

 ** CustomOutputConfiguration **   <a name="mediatailor-Type-Function-CustomOutputConfiguration"></a>
The configuration for a `CUSTOM_OUTPUT` function.  
Type: [CustomOutputConfiguration](API_CustomOutputConfiguration.md) object  
Required: No

 ** Description **   <a name="mediatailor-Type-Function-Description"></a>
A description of the function.  
Type: String  
Required: No

 ** HttpRequestConfiguration **   <a name="mediatailor-Type-Function-HttpRequestConfiguration"></a>
The configuration for an `HTTP_REQUEST` function.  
Type: [HttpRequestConfiguration](API_HttpRequestConfiguration.md) object  
Required: No

 ** SequentialExecutorConfiguration **   <a name="mediatailor-Type-Function-SequentialExecutorConfiguration"></a>
The configuration for a `SEQUENTIAL_EXECUTOR` function.  
Type: [SequentialExecutorConfiguration](API_SequentialExecutorConfiguration.md) object  
Required: No

 ** tags **   <a name="mediatailor-Type-Function-tags"></a>
The tags assigned to the function. Tags are key-value pairs that you can associate with Amazon resources to help with organization, access control, and cost tracking. For more information, see [Tagging AWS Elemental MediaTailor Resources](https://docs.aws.amazon.com/mediatailor/latest/ug/tagging.html).  
Type: String to string map  
Required: No

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

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/mediatailor-2018-04-23/Function) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/mediatailor-2018-04-23/Function) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/mediatailor-2018-04-23/Function)