In a voltaic cell (one that happens spontaneously), electrons flow from a negative electrode to a positive electrode (anode cathode). The reaction that happens is a redox reaction where the anode is oxidized (goes from a solid to an ion) and the cathode is reduced (going from an ion to a solid).
1) Adding salt on the roads in the winter time, 2) Adding salt to the ice bath when making ice cream. 3) Mixing 2 substances when making coolant for a car.
