No one is born a leader. Anyone can be promoted into a boss position, but that does not automatically make one a “leader”. A great boss works to master core leadership skills, and realizes that it is a continuous improvement process. The below links provide good sources of information on the most common perspectives on leadership.
Think about people in your life who you respect and would consider following if asked to work on a project. What about this individual compels you to listen? Why do you trust him or her? Those are the skills a good boss needs to master.