Being a great manager doesn't mean you'll be a great leader and vice versa. Management is about what you do, leadership is about why you do it. A manager is there to manage a team, to develop them, to direct them, to tell them what they should be doing and when they should be doing it.  whilst the leader is someone who sets the big vision for a business for an organization, something that is five years or 10 years down the track and transcendental, and then they hire in managers to help them execute on that vision.