What has been taken as anode and cathode for refining of metals in electrolysis method?

In the method of electrolysis the rod of impure metal is taken as anode and rod of pure metal is taken as cathode. The aqueous solution of salt of, metal is used as an electrolyte. On passing electric current the anode dissolves in the electrolyte and the same proportion of pure metal gets deposited on cathode.

Refining of copper by electrolysis