Sales engineering is a hybrid of sales and engineering that exists in industrial and commercial markets. Buying decisions in these markets are made differently than those in many consumer contexts, being based more on technical information and rational analysis and less on style, fashion, or impulse. 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. They provide this service to various internal or external customers, and they may work for a manufacturer (servicing its industrial-account/business-to-business customers), for a distributor (which in turn services the industrial-account/business-to-business customers), or for a third party such as an engineering consultancy or a systems integrator.