 Therefore, selling in these markets cannot depend on consumer-type sales methods alone, and instead it relies heavily on technical information and problem-solving to convince buyers that they should spend money on the seller's products or services, in order to meet a business need (that is, to satisfy a business case).A sales engineer is thus both "a salesperson that understands and can apply engineering" and "an engineer that understands how to sell engineered systems".They thus not only sell but also provide advice and support.