A person is extradited from one state to another when there is an out of state warrant for their arrest and the other state is willing to spend money and resources to compel them to come to the state to answer for the crime alleged.  An accused has the right to oppose the extradition which would result in court hearings in the responding state.  During these hearings the person is usually under arrest.  To waive extradition is to waive the hearings in the responding state and to go to the other state immediately.