With Azure AD join, you are able to join devices directly to Azure AD without the need to join your on-premises Active Directory in a hybrid environment. While hybrid Azure AD Join with an on-premises AD may still be preferred for some scenarios, Azure AD join simplifies adding devices and modernizes device management for your organization. This can result in the reduction of device-related IT costs. Let's say your users are getting access to corporate assets through their devices. To protect these corporate assets, you want to control these devices. This allows your administrators to make sure that your users are accessing resources from devices that meet your standards for security and compliance.

Azure AD join is a good solution when you want to manage devices with a cloud device management solution, modernize your application infrastructure, simplify device provisioning for geographically distributed users, and when your company is adopting Microsoft 365 as the productivity suite for your users.