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

A key-value pair you can use to manage, filter, and search for your resources. Allowed characters include UTF-8 letters, numbers, and the following characters: \$1 - = . \$1 : /. Spaces are not allowed in tag values.

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

 ** Key **   <a name="Backup-Type-BGW_Tag-Key"></a>
The key part of a tag's key-value pair. The key can't start with `aws:`.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Pattern: `([\p{L}\p{Z}\p{N}_.:/=+\-@]*)`   
Required: Yes

 ** Value **   <a name="Backup-Type-BGW_Tag-Value"></a>
The value part of a tag's key-value pair.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 256.  
Pattern: `[^\x00]*`   
Required: Yes

## See Also
<a name="API_BGW_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/backup-gateway-2021-01-01/Tag) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/backup-gateway-2021-01-01/Tag) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/backup-gateway-2021-01-01/Tag)