AWS CloudFormation Endpoints
To reduce data latency in your applications, most Amazon Web Services products allow you to select a regional endpoint to make your requests. An endpoint is a URL that is the entry point for a web service.
When you work with stacks by using the command line interface or API actions, you can specify a regional endpoint. For more information about the regions and endpoints for AWS CloudFormation, see Regions and Endpoints in the Amazon Web Services General Reference.