Azure AD join allows you to join devices directly to Azure AD without the need to join to on-premises Active Directory while keeping your users productive and secure. Azure AD join is enterprise-ready for both at-scale and scoped deployments.
You should consider Azure AD join if your objective matches any of the following criteria:
You are adopting Microsoft 365 as the productivity suite for your users.
You want to manage devices with a cloud device management solution.
You want to simplify device provisioning for geographically distributed users.
You plan to modernize your application infrastructure.