Entra ID groups can be imported using either a Static mapping strategy or a Dynamic one (Entra ID works for both).
The only difference is in the attribute defined on the corresponding Entra ID entry:
The Static mapping strategy defines a "member" multi-value attribute on the group entry containing user DNs of the group members
The "Dynamic" configuration defines a "memberOf" multi-value attribute on the user entry containing group DNs of the groups the user is a member of.
Entra ID supports both configurations, so you can choose the one that fits your organization's structure.