# Tag


Creates a key-value pair for a specific resource. Tags are metadata that you can use to search for and group a resource for various purposes. You can apply tags to servers, users, and roles. A tag key can take more than one value. For example, to group servers for accounting purposes, you might create a tag called `Group` and assign the values `Research` and `Accounting` to that group.

## Contents


 ** Key **   <a name="TransferFamily-Type-Tag-Key"></a>
The name assigned to the tag that you create.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 128.  
Required: Yes

 ** Value **   <a name="TransferFamily-Type-Tag-Value"></a>
Contains one or more values that you assigned to the key name you create.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 256.  
Required: Yes

## See Also


For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon SDK for C\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/transfer-2018-11-05/Tag) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/transfer-2018-11-05/Tag) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/transfer-2018-11-05/Tag)