Microsoft Azure Resource Manager (ARM) is a management framework that allows users to create, update, and delete resources in Microsoft Azure. It provides a unified way to manage resources such as virtual machines, storage accounts, and networks, enabling users to organize and control their cloud infrastructure efficiently. ARM uses a template-based approach, allowing users to define their resources in a JSON format. This makes it easier to deploy and manage complex applications consistently. Additionally, ARM supports role-based access control, ensuring that users have the appropriate permissions to manage resources securely.