Many business writers have noted a distinction between management and leadership. One source (http://www.futurevisions.org/ldr_mgr.htm) defines the difference as follows:
Managers supervise complexity, plan and budget, determine staffing levels and select personnel, control the organization and solve problems.
Leaders cope with and promote change, determine an organization's direction, organize and align people, motivate and inspire people.
Another source (Hall, Jones et al., Business Studies, pages 519-525 (2001)) makes similar distinctions. To Hall, Jones et al., managers plan, organize, command, coordinate, control, and set objectives. Leaders, according to Hall and Jones et al., are best characterized by characteristics, such as have a positive self image, can get to the essence of a problem, are intelligent and well read, are creative and innovative, and have good skills with people.
These distinctions can be over-emphasized, as to some degree (many authors argue) the tasks of a manager and the characteristics of a leader overlap: a good leader has some capacity to manage and a good manager has some capacity to lead.