Self-management is the idea that teams and individuals can often figure things out on their own, without the need for someone telling them what to do or how to do it.
Self-managed teams and individuals get the work done without authoritarian supervision.
In more modern organizations, individuals are trusted to get results without constant supervision.
That doesn't mean there's no management or no coaching.
On the contrary, self-managed individuals spend less time asking for permission and more time asking for feedback and coaching.
In turn, managers spend less time telling people what to do and more time helping colleagues find solutions.