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Theoretically based on Science but attainment is purely art.
Both
Is a SCIENCE as some theories, science must be studied through scientific institutes.
It is the ART because they need special talents may not be available to anyone. Personal, the art of speaking,the way of dialogue, a method to provide the product,the ability to convince the customer, strength in decision-making,Understand the product and display it attractively, the ability to understand the customer.
Regards.