From reference.com: "Charismatic leadership is the process of encouraging certain behaviors in others via force of personality, persuasion and eloquent communication. Charismatic leaders inspire their followers to do things or to do things better; this is done by conjuring up enthusiasm in others for a stated vision or goal."

To understand charismatic leadership, one must first realize it is an attribution that is based entirely on perceptions and interpretations of a leader's behavior. Further, there are many behaviors associated with charismatic leadership: the expression of a single behavior is rarely sufficient in itself to engender the attribution of charisma (instead, a critical mass of behaviors must be deemed present). What is more, perceptions of charisma differ across time and space (meaning, culture).

In the past, the traditional stereotypes of charismatic leaders were aggressive, demanding, dominant, and critical. In present day, complex organizations, charismatic leaders generally fit the stereotypes of supportive, sensitive, nurturing, and considerate. Somehow, these relatively rare leaders are seen to provide vision, direction, and energy for their organizations.

Thank  you Oliver. Its really interesting. As I understood it is defined as a personal quality, attribution or some times as an out come of a particular relationship between leader, follower and the situation.

Thank you for you interest.