The art and science of influencing others to willingly follow you.
Leadership is more than influence. Influence without will leads to things being partially completed or poorly complete leading to even more problems. The real challenge of a leader is to inspire people to want to accomplish goals.
Inspire.
I know of no safe depository of the ultimate powers of the society but the people themselves, and if we think them not enlightened enough to exercise that control with a wholesome discretion, the remedy is not to take it from them but inform their discretion. Thomas Jefferson (quoted in The Making of The Atomic Bomb – Richard Rhoades)