A Point of Sale (POS) is a cashier counter, or checkout, usually located within a retail shop, or an environment whereby transactions and purchases may occur. The term may also apply to the actual hardware and software including electronic cash registers, barcode scanners, touch screen displays receipt printers, and pole displays. In simpler terms, if something can be exchanged for monetary value, then this will happen at a Point of Sale.

A Mobile Point of Sale (mPOS) is a tablet, smartphone, or wireless device that performs the functions of a regular POS terminal. Any device can be transformed into a mPOS with the use of a dedicated app.