You ring up customers at a point of sale, often known as a point of purchase. Customers are at the point of sale when they complete an online purchase, approach your checkout counter, or choose an item from your stand or booth. The gear and software that make up your point-of-sale system allow your company to generate those sales.The payment counter in a retail business where customers pay for their purchases is known as the point of sale (POS). A POS might be, for instance, the counter at McDonald's where you put your order and pay for it. The POS terminal includes the desktop where the employee enters the information for your order and payment.