Zone resiliency can ensure that an Azure Image is available across availability zones. Not all regions support this feature, but for those that do, it provides a way to achieve reliability in critical services. For more information on regions and availability zones, see the Azure documentation.
References:
https://learn.microsoft.com/en-us/azure/availability-zones/az-overview
In Terraform -
References:
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/image