This is an oxidation-reduction (redox) reaction:
CuII + 2 e- → Cu0 (reduction)
Zn0 - 2 e- → ZnII (oxidation)
CuSO4 is an oxidizing agent, Zn is a reducing agent.
Reactants:
, Blue vitriol (pentahydrate)
, CuSO4 

Products:

, ZnSO4
, Zinc sulphate anhydrous 
