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

Metadata that is associated with AWS resources. In particular, a name-value pair that can be associated with an AWS Cloud9 development environment. There are two types of tags: *user tags* and *system tags*. A user tag is created by the user. A system tag is automatically created by AWS services. A system tag is prefixed with `"aws:"` and cannot be modified by the user.

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

 ** Key **   <a name="cloud9-Type-Tag-Key"></a>
The **name** part of a tag.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Required: Yes

 ** Value **   <a name="cloud9-Type-Tag-Value"></a>
The **value** part of a tag.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 256.  
Required: Yes

## 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/cloud9-2017-09-23/Tag) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/cloud9-2017-09-23/Tag) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/cloud9-2017-09-23/Tag)