When a potential customer becomes serious about the purchase and is likely to buy the product, the customer becomes a A. Sales prospect. A prospect is a potential client or consumer. Since a potential customer is interest in a product but not has purchased it yet, but shows interest in purchasing they are a prospect. A good example of this is is when a sales person sees someone looking at vehicles, they are interested in them and are a prospect when it comes to purchasing the vehicle. The sales person's job, is to make sure the prospect turns into a customer.