Users and Security Roles:

Dynamics 365 allows the creation of user accounts with unique login credentials that’s in AAD. Each user is assigned a security role that defines their privileges and access levels within the Zavanti system. Security roles control which actions and data a user can view, edit, or delete.

Business Units:

Business units in Dynamics 365 help organise users and data within an organization. Each business unit can have its own security roles, allowing for more granular control over access to data and functionality.