There are different kinds of salesperson. There is the product delivery salesperson, e.g. fast food, or mail. There is the order taker, and these may be either 'internal or external. The internal sales person would take an order by telephone, e-mailor over a counter. The external sales person would be working in the field. In both cases little selling is done. There is the missionary who promotes faith, building goodwill with customers with the longer-term aim of generating orders.
The forth type is the technical salesperson, e.g. a technical sales engineer. Their in-depth knowledge supports them as they advise customers on the best purchase for their needs. Finally, there are creative sellers. Creative sellers work to persuade buyers to give them an order. This is tough selling and tends to offer the biggest incentives. The skillis identifying the needs of a customer and persuading them that they need to satisfy their previously unidentified need by giving an order.