AWS CloudFormation Concepts
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Internal
Stack
A stack is a collection of AWS resources that can be managed (create, update or delete) as a single unit. All resources in a stack are defined by the stack's AWS CloudFormation template. Because AWS CloudFormation treats the stack resources as a single unit, they must all be created or deleted successfully for the stack to be created or deleted. If a resource cannot be created, AWS CloudFormation rolls the stack back and automatically deletes any resources that were created. If a resource cannot be deleted, any remaining resources are retained until the stack can be successfully deleted.