PoS
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A POS device is a computerized system that records and tracks sales transactions in a retail or hospitality environment. It typically includes a monitor, a keyboard, and a cash drawer, and can be interfaced with peripheral devices such as barcode scanners, receipt printers, and customer displays.

POS system vs POS device #
There is a certain amount of confusion about the difference between a POS system and a POS device.
POS devices are the hardware used to run a POS system. They include smartphones, tablets, mobile POS (mPOS), card readers, touch screens, cash registers, computers, self-service kiosks, and POS terminals. A POS system is the software used to run the POS device. Essentially a retail management system, in addition to handling sales it tracks inventory and provides access to detailed customer information, both of which help you offer frictionless shopping experiences.