# Tag
<a name="API_Tag"></a>

A complex type that contains `Tag` key and `Tag` value.

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

 ** Key **   <a name="cloudfront-Type-Tag-Key"></a>
A string that contains `Tag` key.  
The string length should be between 1 and 128 characters. Valid characters include `a-z`, `A-Z`, `0-9`, space, and the special characters `_ - . : / = + @`.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Pattern: `([\p{L}\p{Z}\p{N}_.:/=+\-@]*)`   
Required: Yes

 ** Value **   <a name="cloudfront-Type-Tag-Value"></a>
A string that contains an optional `Tag` value.  
The string length should be between 0 and 256 characters. Valid characters include `a-z`, `A-Z`, `0-9`, space, and the special characters `_ - . : / = + @`.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 256.  
Pattern: `([\p{L}\p{Z}\p{N}_.:/=+\-@]*)`   
Required: No

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

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/cloudfront-2020-05-31/Tag) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/cloudfront-2020-05-31/Tag) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/cloudfront-2020-05-31/Tag)