When companies plan out a new product (or service, or business process) they often think of the effort as the coordination of two teams solving different problems. Engineering addresses the question "what can you make?" Marketing addresses the question "what can you sell?"
You could engineer a combined toaster and cell phone, but you could never sell it. Marketing would tell you that you have a product no customer would buy. Likewise, you might successfully market a car that runs on tapwater, but the impossibility of building one makes it a meaningless product idea. Smart organizations know that they need to combine the insights from both marketing and engineering to find products that they can both make and sell.