A Daniel cell is an electrochemical cell that produces electricity through a redox reaction:

It has a copper container filled with copper sulfate (CuSO₄) solution
Inside it, there is an unglazed earthenware pot filled with sulfuric acid (H₂SO₄) or zinc sulfate (ZnSO₄) and a zinc electrode
The zinc acts as the anode (loses electrons), and the copper acts as the cathode (gains electrons)
Electrons flow from zinc to copper, creating an electric current.