What is Apple Business Manager?

Apple Business Manager is a simple, web-based portal for IT administrators to deploy iPhone, iPad, iPod touchApple TV, and Mac computers all from one place. When used with your mobile device management (MDM) solution, you can configure device settings and buy and distribute apps and books. And Apple Business Manager integrates using federated authentication with Microsoft Azure Active Directory (AD) so you can quickly create employee accounts with Managed Apple IDs.

https://support.apple.com/guide/apple-business-manager/what-is-apple-business-manager-apdd344cdd9d/web