You apply tags to your Azure resources, resource groups, and subscriptions to logically organize them into a taxonomy. Each tag consists of a name and a value pair. For example, you can apply the name "Environment" and the value "Production" to all the resources in production Reference: https://docs.microsoft.com/en-us/azure/billing/billing-getting-started https://docs.microsoft.com/en-us/azure/azure-resource-manager/resource-group-using-tags