The point of sale (POS) or point of purchase (POP) isĀ the time and place where a retail transaction is completed. … After receiving payment, the merchant may issue a receipt for the transaction, which is usually printed but can also be dispensed with or sent electronically. POS printers (Point of Sales) are those that, as the name suggests, are used in points of sales for the printing of receipts, which are usually found in supermarkets, shops, restaurants, hotels, etc. in which speed and reliability are necessary at all times.