A logical container in Azure that groups related resources (VMs, databases, networks) to simplify their management, deployment, and joint deletion. Every Azure resource must belong to exactly one resource group.
A fundamental topic in AZ-900 and AZ-104. A resource group can contain resources from different regions. Deleting a resource group deletes all of its resources. Question: can a resource belong to two groups? No.
Resource group (Azure) is a concept that can show up on the exam. Check the full guide to see it in context.