ARM templates allow for the automated and consistent deployment of Azure resources. They define the resources you need in a declarative JSON format so that your infrastructure and its configuration can be versioned and treated as code. This is essential for consistent deployment across different environments. The Azure portal is a web-based user interface for interacting with Azure resources, but does not natively offer the same level of automation and declarative configuration as ARM templates. Azure CLI is a command-line tool which certainly can be used to deploy resources but lacks the declarative, version-controlled approach provided by ARM templates in JSON. Azure Advisor is a service that provides recommendations based on best practices, but does not manage resource deployments.