Profiles are the primary means by which you can manage devices. Profiles are the settings, configurations, and restrictions that, when combined with compliance policies, help you enforce corporate rules and procedures.
The individual settings you configure, such as Wi-Fi, VPN, and passcodes, are called payloads. In most cases, only one payload is associated per profile for security profiles, which means you have multiple security profiles for different settings you want to establish.
When you configure a profile for a deployment integrated with Apple School Manager, you must select whether a profile applies to a Device or a User. User profiles are important for Shared Device deployments where users may log in to multiple devices, and need the proper Profile configuration present on each device.