Apple introducedUser Enrollmentto support BYOD (Bring Your Own Device) scenarios. In bothAccount-driven User EnrollmentandAutomated User Enrollment, data separation is cryptographically enforced between organizational and personal data. Apple Learning emphasizes that apps like Calendar, Contacts, Notes, and Mail can store both personal and work accounts, but the data is kept in separate containers that cannot interact. For example, an organization’s managed calendar events cannot be copied into a user’s personal calendar. This guarantees user privacy while protecting organizational data. Automated Device Enrollment, by contrast, fully manages the device and does not enforce the same cryptographic separation. Profile-driven User Enrollment is deprecated in favor of account-driven. The key principle here is thatUser Enrollment modes create strong boundaries between personal and managed data.