Parent: Azure
Azure manages each of their services in a JSON format called Resources, which stores all the necessary information required to deploy it in a JSON format (which is really great for IaaC). Everything that is manageable from the Azure web app is called a resource including : Virtual machines, storage accounts, databases, virtual networks etc.
A collection of resources in JSON format is called a resource group. Using resources groups your organization can categorize and group resources in any way that makes sense for you particular need.
Azure manages the authentication and capacities of each resource using the Azure Resource Manager