what are crystals?how can the crystals of sodium chloride be prepared from table salt?

Kindly refer to the following link:
https://www.meritnation.com/ask-answer/question/what-is-crystal-lattice/science/3003639 
Crystals of NaCl can be prepared by dissolving it in a mixture of ethanol and water (1:0.5) at high temperature and allow it to cool at room temperature, after some time you will observe crystals of NaCl.

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