Large crystals of pure substances can be formed from their impure solution. This process of obtaining crystals of pure substances is called crystallisation. It is an example of a physical change.

The process of making crystals of any substance is known as crystallisatiin.

Crystallisation is a process that separates a pure solid in the form of its crystals from a solution. The crystallisation method is used to purify solids.For example, the salt we get from sea water can have many impurities in it. To remove these impurities, the process of crystallisation is used.
It is the process in which pure solid can be seperated into solution from its crystals.