10 Al (s) + 6 KMnO4 (aq) + 24 H2SO4 (aq) → 5 Al2(SO4)3 (aq) + 6 MnSO4 (aq) + 3 K2SO4 (aq) + 24 H2O (l)
This is an oxidation-reduction (redox) reaction:
6 MnVII + 30 e- → 6 MnII (reduction)
10 Al0 - 30 e- → 10 AlIII (oxidation)
KMnO4 is an oxidizing agent, Al is a reducing agent.