What is a cash register?

Today's store cash register is a system consisting of a set of hardware and software that includes a complete computer with one or two monitors (buyer and seller side) that issues a receipt with purchase details for the buyer and a software on the seller. It is installed that also performs the mechanized control and accounting process. This device is called "POS" or (POS=Point Of Service). These terminals, which are essentially a computer, are designed to be used at the point of sale, so that they occupy less space, and its peripherals are suitable for cashier use. In these terminals, a gun barcode reader that is used to identify the product and a printer to print the customer's invoice, and having a cash drawer and a customer-specific display in addition to the seller's monitor screen and a receipt printer are the main features of this type of terminals.