What is the difference between the terms ‘hydrolysis’ and ‘hydration’?

Hydrolysis is defined as a chemical reaction in which hydrogen and hydroxide ions (H⁺ and OH^- ions) of water molecule react with a compound to form products. For example:

CaO + H₂O → Ca (OH) ₂

Hydration is defined as the addition of one or more water molecules to ions or molecules to form hydrated compounds. For example:

CuSO₄ + 5H₂O → CuSO₄.5H₂O