In Protestantism, a pastor may be ordained or not (even a layperson may serve in this capacity) while in the Catholic Church and Orthodox Churches, the pastor is always an ordained priest. Pastors are to act like shepherds by caring for the flock, and this care includes teaching.
Who is the leader of the Protestant Church?
Martin Luther, often called the father of Protestantism, fundamentally changed the Christian world through his force of will and new ideas. He tried passionately to reform the Catholic Church.