Explain the term water of crystallisation

Definition of water of crystallization

• The water of crystallization is defined as the fixed number of water molecules present in one formula of a unit of salt.
• The crystal salts containing the water of crystallization are known as hydrates.
• Examples are hydrated Copper (II) sulfate ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$

Therefore, we can say that water of crystallization is the fixed number of water molecules that are present in one formula of a unit of salt