Device Administrator (DA) is the legacy, now-deprecated way of managing Android. It was introduced in Android 2.2 back in 2010 as the first form of Android device management, letting IT enforce strong passwords and storage encryption, and lock or wipe a device. Its core weakness is an "all-or-nothing" model: it requests control over the entire device, with no separation between corporate and personal data — a poor fit for both BYOD privacy and modern security needs.
Android Enterprise replaced it with containerization and dedicated management modes (work profiles and device-owner modes), giving far more granular control plus a clean separation between work and personal data.