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A <strong>stack</strong> is a collection of AWS resources that you can manage as a single unit. In other words, you can create, update, or delete a collection of resources by creating, updating, or deleting <strong>stacks</strong>. All the resources in a <strong>stack</strong> are defined by the <strong>stack’s </strong>AWS <a href="http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/stacks.html" target="_blank">CloudFormation</a> template.