Leadership style is the pattern of behaviors you use when you are trying to influence the behavior of others. An emphasis on what will be rather than what is.
Leadership provides the vision, and management gets things done.
Leadership can be learned. An emphasis on what will be rather than what is. To bring it down to a level we can all relate to, a leader should be able to state in concrete ideas how programs will work, who will be served, what outcomes are expected from a project, what technology will be used and how the organization will get there. Tell people what you want and expect from them and don't waste their time. There are always distractions and personality conflicts but leaders should be able to see beyond them to what it will take to get the job done effectively.