What happens if you use Fn::GetAZs without specifying a region?

When using the Fn::GetAZs function in AWS CloudFormation, specifying a region is essential for the function to operate correctly. If a region is not specified, the function cannot determine which Availability Zones to return. Consequently, it results in an error because Fn::GetAZs requires at least one region as an argument to function. The context of this behavior underscores the importance of providing proper parameters to AWS functions in order to utilize them effectively.

Understanding this concept is vital for managing resources in AWS, as developers must ensure that functions like Fn::GetAZs are used with the correct syntax and parameters to avoid interruptions in their CloudFormation templates. This reinforces best practices in cloud resource management, where accurate and precise configurations are key to successful deployments.