What really is the real difference between marketing and sales in practice ?

The textbooks say that sales is a part of marketing. But that is only on paper. As Philip Kotler himself says, the economics and culture of the marketing and sales departments is very different and it is very difficult to get a person to head and lead both the departments at the same time! Actually it gets much more complex than that because the exact job description of marketing and sales varies significantly from company to company and industry to industry. 

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