People usually assume that a manager, by default, is a leader. In reality a leader and a manager can be distinguished clearly. The leader has followers and the manager is a follower. The following comparison is taken from (Bennis, 16):
A manager is an administrator while a leader is an innovator.
A manager maintains the current resources and assets while a leader develops them.
System is the main focus of a manager. People, in contrast, are the focus of a leader.
A manager “manages” trough control. A leader “leads” through trust.
“How and when” the concerns of a manager are “What” and ...