What Is A POS Cash Register? A POS cash register is more than a basic checkout machine. It can process payments, track inventory, store sales data, and support better business decisions. Unlike traditional registers, modern POS cash register systems help retailers and small businesses improve efficiency, accuracy, and daily operations. This article explains what a POS cash register is, how it works, how it compares with a basic register, and why it can be a smart choice for growing businesses.