Security groups are a great way to control which users have access to which of your environments. If you have multiple environments and not every user is allowed to have access to any, security groups will help us achieve this goal.
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Dataverse uses role-based security to group together a collection of privileges. These security roles can be associated directly to users, or they can be associated with Dataverse teams and business units.
Azure and Microsoft 365 are the culmination of decades of technical evolution and the desire to be as backwards compatible as possible.
If your company has multiple environments, you can use security groups to control which licensed users can be a member of a particular environment.