AWS CloudFormation is an application management tool which provides application modeling,deployment, configuration, management and related activities. The AWS CloudFormation stack is acollection of AWS resources which are created and managed as a single unit when AWSCloudFormation instantiates a template. If any of the services fails to launch, CloudFormation willrollback all the changes and terminate or delete all the created services. Reference: http://aws.amazon.com/cloudformation/faqs/