A cash register is a device used by businesses to process payments for products or services. It is typically used in retail stores, grocery stores and other places where physical goods are sold. The cash register itself is a mechanical or electronic device that performs calculations and processes payments.

A POS (point of sale) system is a computerized system that handles all aspects of business transactions at a storefront location. It includes the cash register but also includes inventory management and customer relationship management (CRM) software. A POS system provides many benefits to retailers, including increased efficiency and better customer service.

The main difference between a cash register and a POS is that while a cash register is used only for financial transactions, a POS can be used for customer tracking as well.