The words "leader" and "leadership" are often used incorrectly to describe people who are actually managing. These individuals may be highly skilled, good at their jobs, and valuable to their organizations – but that just makes them excellent managers, not leaders.
So, be careful how you use the terms, and don't assume that people with "leader" in their job titles, people who describe themselves as "leaders," or even groups called "leadership teams," are actually creating and delivering transformational change.
A particular danger in these situations is that people or organizations that are being managed by such an individual or group think they're being led; but they're not. There may actually be no leadership at all, with no one setting a vision and no one being inspired. This can cause serious problems in the long term.
Leadership can be hard to define and it means different things to different people.
In the transformational leadership model, leaders set direction and help themselves and others to do the right thing to move forward. To do this they create an inspiring vision, and then motivate and inspire others to reach that vision. They also manage delivery of the vision, either directly or indirectly, and build and coach their teams to make them stronger.