Azure AD is a cloud-based IAM solution and directory by Microsoft. It brings together application access management, core directory services, and identity protection and turns them into a single solution. It helps employees of an organization sign in and access resources such as:
External resources, including Microsoft 365, the Azure portal, and a big number of SaaS applications
Internal resources, such as apps on a corporate network and intranet, as well as any cloud-based apps built by that organization
Azure AD is intended for use by:
IT Admins
App Developers
Azure, Office 365, Microsoft 365, or Dynamics CRM online subscribers