What is it that makes some people excel in leadership roles? Leadership theories seek to explain how and why certain people become leaders. Such theories often focus on the characteristics of leaders, but some attempt to identify the behaviors that people can adopt to improve their own leadership abilities in different situations.
Early debates on the psychology of leadership often suggested that such skills were simply abilities that people were born with. In other words, these theories proposed that certain people were simply "born leaders." Some more recent theories propose that possessing certain traits may help make people nature leaders, but that experience and situational variables also play a critical role.
A very useful set of articles here that provide an overview, and more in-depth descriptions of these 8 key theories.