The phase change reaction in a Daniell cell is an example of a reversible process.
This is because the reaction can proceed in both forward and reverse directions depending on the external conditions.
A Daniell cell is the best example of a galvanic cell which converts chemical energy into electrical energy.
The Daniell cell consists of two electrodes of dissimilar metals, Zn and Cu; each electrode is in contact with a solution of its own ion; Zinc sulphate and copper sulphate respectively.
