What is a leader?

What is a leader? "Someone with internal and external strength. Someone who is great in a particular field, stands out from the rest and leads the way." A leader must have strong communication and interpersonal skills, and ability to work in a cross functional environment. A leader must be innovate, take challenges and never stop learning. George Washington, Abraham Lincoln, Winston Churchill, and of course, Myself, all fit these descriptions. We all also possess other characteristics that are needed to succeed in life.
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To be a leader, one must also produce a better service, find a new "thing" that everyone must have or will want or by "doing or making an old thing in a better way".
A few companies, for example, who fit this description, is Apple (AAPL), General Electric (GE) and Goldman Sachs (GS).