# Environment
<a name="API_Environment"></a>

A function's environment variable settings. You can use environment variables to adjust your function's behavior without updating code. An environment variable is a pair of strings that are stored in a function's version-specific configuration.

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

 ** Variables **   <a name="lambda-Type-Environment-Variables"></a>
Environment variable key-value pairs. For more information, see [Using Lambda environment variables](https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html).  
Type: String to string map  
Key Pattern: `[a-zA-Z]([a-zA-Z0-9_])+`   
Required: No

## See Also
<a name="API_Environment_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/lambda-2015-03-31/Environment) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/lambda-2015-03-31/Environment) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/lambda-2015-03-31/Environment)