Explain the difference between Azure Resource Manager and Classic deployment models.

Azure Resource Manager (ARM) is the modern deployment model that replaced the Classic model:\n\n• ARM provides resource grouping, role-based access control, and tagging\n• Supports JSON templates for infrastructure as code\n• Enables parallel deployment and dependency management\n• Classic model is legacy with limited management capabilities\n\nARM offers better security, management, and deployment features. Microsoft recommends migrating from Classic to ARM for all new deployments.