There are many qualities that make a good leader. Some qualities are more important that others; some qualities are more difficult see or develop; other qualities are more defined and expected. In general, people have an ideal set of qualities they expect a leader to have. Here is a short list of those qualities.
This skill-set can be summed up in many ways, using words such as vision and competence. Of course this list is no where near complete, but this is the basic list I feel is important to focus on when developing your leadership skill-set.