# Reservation
<a name="API_Reservation"></a>

Describes a launch request for one or more instances, and includes owner, requester, and security group information that applies to all instances in the launch request.

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

 ** GroupSet.N **   
Not supported.  
Type: Array of [GroupIdentifier](API_GroupIdentifier.md) objects  
Required: No

 ** InstancesSet.N **   
The instances.  
Type: Array of [Instance](API_Instance.md) objects  
Required: No

 ** ownerId **   
The ID of the AWS account that owns the reservation.  
Type: String  
Required: No

 ** requesterId **   
The ID of the requester that launched the instances on your behalf (for example, AWS Management Console or Auto Scaling).  
Type: String  
Required: No

 ** reservationId **   
The ID of the reservation.  
Type: String  
Required: No

## See Also
<a name="API_Reservation_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/ec2-2016-11-15/Reservation) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ec2-2016-11-15/Reservation) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ec2-2016-11-15/Reservation)