The management layer that processes every create, update, and delete request for Azure resources. It enables infrastructure as code through ARM templates (JSON) or Bicep.
The foundation of every Azure deployment, covered in AZ-900 and AZ-104. ARM templates are Azure's equivalent of AWS CloudFormation. Question: what tool do you use to deploy repeatable infrastructure in Azure? ARM templates or Bicep.
Azure Resource Manager (ARM) is a concept that can show up on the exam. Check the full guide to see it in context.